diff --git a/core/assets/bundles/bundle.properties b/core/assets/bundles/bundle.properties
index c1c89aa4e7..3561a3f20c 100644
--- a/core/assets/bundles/bundle.properties
+++ b/core/assets/bundles/bundle.properties
@@ -492,6 +492,7 @@ filter.option.block = Block
 filter.option.floor = Floor
 filter.option.flooronto = Target Floor
 filter.option.target = Target
+filter.option.replacement = Replacement
 filter.option.wall = Wall
 filter.option.ore = Ore
 filter.option.floor2 = Secondary Floor
@@ -994,6 +995,7 @@ rules.waves = Waves
 rules.attack = Attack Mode
 rules.buildai = AI Building
 rules.corecapture = Capture Core On Destruction
+rules.polygoncoreprotection = Polygonal Core Protection
 rules.enemyCheat = Infinite AI (Red Team) Resources
 rules.blockhealthmultiplier = Block Health Multiplier
 rules.blockdamagemultiplier = Block Damage Multiplier
diff --git a/core/assets/maps/glacier.msav b/core/assets/maps/glacier.msav
index 73796f7643..efe240108d 100644
Binary files a/core/assets/maps/glacier.msav and b/core/assets/maps/glacier.msav differ
diff --git a/core/assets/maps/passage.msav b/core/assets/maps/passage.msav
new file mode 100644
index 0000000000..b6816fba7b
Binary files /dev/null and b/core/assets/maps/passage.msav differ
diff --git a/core/assets/maps/veins.msav b/core/assets/maps/veins.msav
index 3273feb74b..037d3f0b75 100644
Binary files a/core/assets/maps/veins.msav and b/core/assets/maps/veins.msav differ
diff --git a/core/src/mindustry/content/Fx.java b/core/src/mindustry/content/Fx.java
index 56246bc02f..d5b9ffcf7b 100644
--- a/core/src/mindustry/content/Fx.java
+++ b/core/src/mindustry/content/Fx.java
@@ -1113,6 +1113,47 @@ public class Fx{
         });
     }),
 
+    impactReactorExplosion = new Effect(30, 500f, b -> {
+        float intensity = 8f;
+        float baseLifetime = 25f + intensity * 15f;
+        b.lifetime = 50f + intensity * 64f;
+
+        color(Pal.lighterOrange);
+        alpha(0.8f);
+        for(int i = 0; i < 5; i++){
+            rand.setSeed(b.id*2 + i);
+            float lenScl = rand.random(0.25f, 1f);
+            int fi = i;
+            b.scaled(b.lifetime * lenScl, e -> {
+                randLenVectors(e.id + fi - 1, e.fin(Interp.pow10Out), (int)(2.8f * intensity), 25f * intensity, (x, y, in, out) -> {
+                    float fout = e.fout(Interp.pow5Out) * rand.random(0.5f, 1f);
+                    float rad = fout * ((2f + intensity) * 2.35f);
+
+                    Fill.circle(e.x + x, e.y + y, rad);
+                    Drawf.light(e.x + x, e.y + y, rad * 2.6f, Pal.lighterOrange, 0.7f);
+                });
+            });
+        }
+
+        b.scaled(baseLifetime, e -> {
+            Draw.color();
+            e.scaled(5 + intensity * 2f, i -> {
+                stroke((3.1f + intensity/5f) * i.fout());
+                Lines.circle(e.x, e.y, (3f + i.fin() * 14f) * intensity);
+                Drawf.light(e.x, e.y, i.fin() * 14f * 2f * intensity, Color.white, 0.9f * e.fout());
+            });
+
+            color(Color.white, Pal.lighterOrange, e.fin());
+            stroke((2f * e.fout()));
+
+            Draw.z(Layer.effect + 0.001f);
+            randLenVectors(e.id + 1, e.finpow() + 0.001f, (int)(8 * intensity), 30f * intensity, (x, y, in, out) -> {
+                lineAngle(e.x + x, e.y + y, Mathf.angle(x, y), 1f + out * 4 * (4f + intensity));
+                Drawf.light(e.x + x, e.y + y, (out * 4 * (3f + intensity)) * 3.5f, Draw.getColor(), 0.8f);
+            });
+        });
+    }),
+
     blockExplosion = new Effect(30, e -> {
         e.scaled(7, i -> {
             stroke(3.1f * i.fout());
diff --git a/core/src/mindustry/editor/MapInfoDialog.java b/core/src/mindustry/editor/MapInfoDialog.java
index da4bf5a4b3..288f7224c3 100644
--- a/core/src/mindustry/editor/MapInfoDialog.java
+++ b/core/src/mindustry/editor/MapInfoDialog.java
@@ -7,6 +7,7 @@ import arc.util.*;
 import mindustry.*;
 import mindustry.game.*;
 import mindustry.io.*;
+import mindustry.maps.filters.*;
 import mindustry.ui.*;
 import mindustry.ui.dialogs.*;
 
@@ -74,7 +75,11 @@ public class MapInfoDialog extends BaseDialog{
             t.row();
             t.add("@editor.generation").padRight(8).left();
             t.button("@edit", () -> {
-                generate.show(maps.readFilters(editor.tags.get("genfilters", "")),
+                //randomize so they're not all the same seed
+                var res = maps.readFilters(editor.tags.get("genfilters", ""));
+                res.each(GenerateFilter::randomize);
+
+                generate.show(res,
                 filters -> {
                     //reset seed to 0 so it is not written
                     filters.each(f -> f.seed = 0);
diff --git a/core/src/mindustry/entities/Damage.java b/core/src/mindustry/entities/Damage.java
index 176761c349..7c69b06cb2 100644
--- a/core/src/mindustry/entities/Damage.java
+++ b/core/src/mindustry/entities/Damage.java
@@ -34,13 +34,18 @@ public class Damage{
         dynamicExplosion(x, y, flammability, explosiveness, power, radius, damage, true, null, Fx.dynamicExplosion);
     }
 
+    /** Creates a dynamic explosion based on specified parameters. */
+    public static void dynamicExplosion(float x, float y, float flammability, float explosiveness, float power, float radius, boolean damage, Effect explosionFx){
+        dynamicExplosion(x, y, flammability, explosiveness, power, radius, damage, true, null, explosionFx);
+    }
+
     /** Creates a dynamic explosion based on specified parameters. */
     public static void dynamicExplosion(float x, float y, float flammability, float explosiveness, float power, float radius, boolean damage, boolean fire, @Nullable Team ignoreTeam){
         dynamicExplosion(x, y, flammability, explosiveness, power, radius, damage, fire, ignoreTeam, Fx.dynamicExplosion);
     }
 
     /** Creates a dynamic explosion based on specified parameters. */
-    public static void dynamicExplosion(float x, float y, float flammability, float explosiveness, float power, float radius, boolean damage, boolean fire, @Nullable Team ignoreTeam, Effect explosion){
+    public static void dynamicExplosion(float x, float y, float flammability, float explosiveness, float power, float radius, boolean damage, boolean fire, @Nullable Team ignoreTeam, Effect explosionFx){
         if(damage){
             for(int i = 0; i < Mathf.clamp(power / 700, 0, 8); i++){
                 int length = 5 + Mathf.clamp((int)(power / 500), 1, 20);
@@ -74,7 +79,7 @@ public class Damage{
 
         float shake = Math.min(explosiveness / 4f + 3f, 9f);
         Effect.shake(shake, shake, x, y);
-        explosion.at(x, y, radius / 8f);
+        explosionFx.at(x, y, radius / 8f);
     }
 
     public static void createIncend(float x, float y, float range, int amount){
diff --git a/core/src/mindustry/entities/comp/BuildingComp.java b/core/src/mindustry/entities/comp/BuildingComp.java
index 6c6bf1250d..83c20b40ab 100644
--- a/core/src/mindustry/entities/comp/BuildingComp.java
+++ b/core/src/mindustry/entities/comp/BuildingComp.java
@@ -1059,7 +1059,7 @@ abstract class BuildingComp implements Posc, Teamc, Healthc, Buildingc, Timerc,
             });
         }
 
-        Damage.dynamicExplosion(x, y, flammability, explosiveness * 3.5f, power, tilesize * block.size / 2f, state.rules.damageExplosions);
+        Damage.dynamicExplosion(x, y, flammability, explosiveness * 3.5f, power, tilesize * block.size / 2f, state.rules.damageExplosions, block.destroyEffect);
 
         if(!floor().solid && !floor().isLiquid){
             Effect.rubble(x, y, block.size);
diff --git a/core/src/mindustry/game/EventType.java b/core/src/mindustry/game/EventType.java
index 015eac0c97..9d590de52c 100644
--- a/core/src/mindustry/game/EventType.java
+++ b/core/src/mindustry/game/EventType.java
@@ -9,6 +9,7 @@ import mindustry.net.*;
 import mindustry.net.Packets.*;
 import mindustry.type.*;
 import mindustry.world.*;
+import mindustry.world.blocks.storage.CoreBlock.*;
 
 public class EventType{
 
@@ -283,6 +284,15 @@ public class EventType{
         }
     }
 
+    /** Called when a core block is placed/removed or its team is changed. */
+    public static class CoreChangeEvent{
+        public CoreBuild core;
+
+        public CoreChangeEvent(CoreBuild core){
+            this.core = core;
+        }
+    }
+
     public static class StateChangeEvent{
         public final State from, to;
 
diff --git a/core/src/mindustry/game/Rules.java b/core/src/mindustry/game/Rules.java
index 093a09f722..b0dd8d3b4f 100644
--- a/core/src/mindustry/game/Rules.java
+++ b/core/src/mindustry/game/Rules.java
@@ -68,6 +68,8 @@ public class Rules{
     public float deconstructRefundMultiplier = 0.5f;
     /** No-build zone around enemy core radius. */
     public float enemyCoreBuildRadius = 400f;
+    /** If true, no-build zones are calculated based on the closest core. */
+    public boolean polygonCoreProtection = false;
     /** Radius around enemy wave drop zones.*/
     public float dropZoneRadius = 300f;
     /** Time between waves in ticks. */
diff --git a/core/src/mindustry/graphics/OverlayRenderer.java b/core/src/mindustry/graphics/OverlayRenderer.java
index 5279de9e4d..a75555b60b 100644
--- a/core/src/mindustry/graphics/OverlayRenderer.java
+++ b/core/src/mindustry/graphics/OverlayRenderer.java
@@ -5,14 +5,18 @@ import arc.graphics.*;
 import arc.graphics.g2d.*;
 import arc.math.*;
 import arc.math.geom.*;
+import arc.struct.*;
 import arc.util.*;
 import mindustry.*;
 import mindustry.ai.types.*;
 import mindustry.entities.*;
+import mindustry.game.EventType.*;
+import mindustry.game.*;
+import mindustry.game.Teams.*;
 import mindustry.gen.*;
 import mindustry.input.*;
-import mindustry.ui.*;
 import mindustry.world.*;
+import mindustry.world.blocks.storage.CoreBlock.*;
 
 import static mindustry.Vars.*;
 
@@ -23,6 +27,42 @@ public class OverlayRenderer{
 
     private float buildFade, unitFade;
     private Sized lastSelect;
+    private Seq<CoreEdge> cedges = new Seq<>();
+    private boolean updatedCores;
+
+    public OverlayRenderer(){
+        Events.on(WorldLoadEvent.class, e -> {
+            updatedCores = true;
+        });
+
+        Events.on(CoreChangeEvent.class, e -> {
+            updatedCores = true;
+        });
+    }
+
+    private void updateCoreEdges(){
+        if(!updatedCores){
+            return;
+        }
+
+        updatedCores = false;
+        cedges.clear();
+
+        Seq<Vec2> pos = new Seq<>();
+        Seq<CoreBuild> teams = new Seq<>();
+        for(TeamData team : state.teams.active){
+            for(CoreBuild b : team.cores){
+                teams.add(b);
+                pos.add(new Vec2(b.x, b.y));
+            }
+        }
+
+        //if this is laggy, it could be shoved in another thread.
+        var result = Voronoi.generate(pos.toArray(Vec2.class), 0, world.unitWidth(), 0, world.unitHeight());
+        for(var edge : result){
+            cedges.add(new CoreEdge(edge.x1, edge.y1, edge.x2, edge.y2, teams.get(edge.site1).team, teams.get(edge.site2).team));
+        }
+    }
 
     public void drawBottom(){
         InputHandler input = control.input;
@@ -117,15 +157,32 @@ public class OverlayRenderer{
         Lines.stroke(buildFade * 2f);
 
         if(buildFade > 0.005f){
-            state.teams.eachEnemyCore(player.team(), core -> {
-                float dst = core.dst(player);
-                if(dst < state.rules.enemyCoreBuildRadius * 2.2f){
-                    Draw.color(Color.darkGray);
-                    Lines.circle(core.x, core.y - 2, state.rules.enemyCoreBuildRadius);
-                    Draw.color(Pal.accent, core.team.color, 0.5f + Mathf.absin(Time.time, 10f, 0.5f));
-                    Lines.circle(core.x, core.y, state.rules.enemyCoreBuildRadius);
+            if(state.rules.polygonCoreProtection){
+                updateCoreEdges();
+                Draw.color(Pal.accent);
+
+                for(int i = 0; i < 2; i++){
+                    float offset = (i == 0 ? -2f : 0f);
+                    for(CoreEdge edge : cedges){
+                        Team displayed = edge.displayed();
+                        if(displayed != null){
+                            Draw.color(i == 0 ? Color.darkGray : Tmp.c1.set(displayed.color).lerp(Pal.accent, Mathf.absin(Time.time, 10f, 0.2f)));
+                            Lines.line(edge.x1, edge.y1 + offset, edge.x2, edge.y2 + offset);
+                        }
+                    }
                 }
-            });
+
+                Draw.color();
+            }else{
+                state.teams.eachEnemyCore(player.team(), core -> {
+                    if(Core.camera.bounds(Tmp.r1).overlaps(Tmp.r2.setCentered(core.x, core.y, state.rules.enemyCoreBuildRadius * 2f))){
+                        Draw.color(Color.darkGray);
+                        Lines.circle(core.x, core.y - 2, state.rules.enemyCoreBuildRadius);
+                        Draw.color(Pal.accent, core.team.color, 0.5f + Mathf.absin(Time.time, 10f, 0.5f));
+                        Lines.circle(core.x, core.y, state.rules.enemyCoreBuildRadius);
+                    }
+                });
+            }
         }
 
         Lines.stroke(2f);
@@ -192,4 +249,28 @@ public class OverlayRenderer{
             }
         }
     }
+
+    private static class CoreEdge{
+        float x1, y1, x2, y2;
+        Team t1, t2;
+
+        public CoreEdge(float x1, float y1, float x2, float y2, Team t1, Team t2){
+            this.x1 = x1;
+            this.y1 = y1;
+            this.x2 = x2;
+            this.y2 = y2;
+            this.t1 = t1;
+            this.t2 = t2;
+        }
+
+        @Nullable
+        Team displayed(){
+            return
+                t1 == t2 ? null :
+                t1 == player.team() ? t2 :
+                t2 == player.team() ? t1 :
+                t2.id == 0 ? t1 :
+                t1.id < t2.id && t1.id != 0 ? t1 : t2;
+        }
+    }
 }
diff --git a/core/src/mindustry/graphics/Voronoi.java b/core/src/mindustry/graphics/Voronoi.java
new file mode 100755
index 0000000000..7b10e497e2
--- /dev/null
+++ b/core/src/mindustry/graphics/Voronoi.java
@@ -0,0 +1,643 @@
+package mindustry.graphics;
+
+import arc.math.geom.*;
+import arc.struct.*;
+
+import java.util.*;
+
+//TODO in dire need of cleanup
+public class Voronoi{
+    private final static int LE = 0;
+    private final static int RE = 1;
+
+    //TODO make local
+    int siteidx;
+    Site[] sites;
+    int nsites;
+    float borderMinX, borderMaxX, borderMinY, borderMaxY;
+    float ymin;
+    float deltay;
+    int nvertices = 0;
+    int nedges;
+    Site bottomsite;
+    int PQcount;
+    int PQmin;
+    int PQhashsize;
+    Halfedge[] PQhash;
+    int ELhashsize;
+    Halfedge[] ELhash;
+    Seq<GraphEdge> allEdges;
+    float minDistanceBetweenSites = 1f;
+
+    public static Seq<GraphEdge> generate(Vec2[] values, float minX, float maxX, float minY, float maxY){
+        return new Voronoi().generateVoronoi(values, minX, maxX, minY, maxY);
+    }
+
+    Seq<GraphEdge> generateVoronoi(Vec2[] values, float minX, float maxX, float minY, float maxY){
+        allEdges = new Seq<>();
+
+        nsites = values.length;
+
+        float sn = (float)nsites + 4;
+        int rtsites = (int)Math.sqrt(sn);
+
+        sites = new Site[nsites];
+        Vec2 first = values[0];
+        float xmin = first.x;
+        ymin = first.y;
+        float xmax = first.x;
+        float ymax = first.y;
+        for(int i = 0; i < nsites; i++){
+            sites[i] = new Site();
+            sites[i].coord.set(values[i]);
+            sites[i].sitenbr = i;
+
+            if(values[i].x < xmin){
+                xmin = values[i].x;
+            }else if(values[i].x > xmax){
+                xmax = values[i].x;
+            }
+
+            if(values[i].y < ymin){
+                ymin = values[i].y;
+            }else if(values[i].y > ymax){
+                ymax = values[i].y;
+            }
+        }
+
+        Arrays.sort(sites, (p1, p2) -> {
+            Vec2 s1 = p1.coord, s2 = p2.coord;
+            if(s1.y < s2.y){
+                return (-1);
+            }
+            if(s1.y > s2.y){
+                return (1);
+            }
+            return Float.compare(s1.x, s2.x);
+        });
+
+        deltay = ymax - ymin;
+        float deltax = xmax - xmin;
+
+        // Check bounding box inputs - if mins are bigger than maxes, swap them
+        float temp;
+        if(minX > maxX){
+            temp = minX;
+            minX = maxX;
+            maxX = temp;
+        }
+        if(minY > maxY){
+            temp = minY;
+            minY = maxY;
+            maxY = temp;
+        }
+        borderMinX = minX;
+        borderMinY = minY;
+        borderMaxX = maxX;
+        borderMaxY = maxY;
+
+        siteidx = 0;
+
+        PQcount = 0;
+        PQmin = 0;
+        PQhashsize = 4 * rtsites;
+        PQhash = new Halfedge[PQhashsize];
+
+        for(int i2 = 0; i2 < PQhashsize; i2 += 1){
+            PQhash[i2] = new Halfedge();
+        }
+        int i1;
+        ELhashsize = 2 * rtsites;
+        ELhash = new Halfedge[ELhashsize];
+
+        for(i1 = 0; i1 < ELhashsize; i1 += 1){
+            ELhash[i1] = null;
+        }
+        Halfedge ELleftend = newHe(null, 0);
+        Halfedge ELrightend = newHe(null, 0);
+        ELleftend.ELleft = null;
+        ELleftend.ELright = ELrightend;
+        ELrightend.ELleft = ELleftend;
+        ELrightend.ELright = null;
+        ELhash[0] = ELleftend;
+        ELhash[ELhashsize - 1] = ELrightend;
+
+        bottomsite = next();
+        Site newsite = next();
+        Halfedge lbnd;
+        Vec2 newintstar = null;
+        Edge e;
+        while(true){
+            if(PQcount != 0){
+                Vec2 answer = new Vec2();
+
+                while(PQhash[PQmin].PQnext == null){
+                    PQmin += 1;
+                }
+                answer.x = PQhash[PQmin].PQnext.vertex.coord.x;
+                answer.y = PQhash[PQmin].PQnext.ystar;
+                newintstar = (answer);
+            }
+
+            Halfedge rbnd;
+            Halfedge bisector;
+            Site p;
+            Site bot;
+
+            if(newsite != null && (PQcount == 0 || newsite.coord.y < newintstar.y || (newsite.coord.y == newintstar.y && newsite.coord.x < newintstar.x))){
+                int bucket = (int)(((newsite.coord).x - xmin) / deltax * ELhashsize);
+
+                if(bucket < 0){
+                    bucket = 0;
+                }
+                if(bucket >= ELhashsize){
+                    bucket = ELhashsize - 1;
+                }
+
+                Halfedge he = getHash(bucket);
+                if(he == null){
+                    for(int i = 1; i < ELhashsize; i += 1){
+                        if((he = getHash(bucket - i)) != null){
+                            break;
+                        }
+                        if((he = getHash(bucket + i)) != null){
+                            break;
+                        }
+                    }
+                }
+                if(he == ELleftend || (he != ELrightend && right(he, (newsite.coord)))){
+                    do{
+                        he = he.ELright;
+                    }while(he != ELrightend && right(he, (newsite.coord)));
+                    he = he.ELleft;
+                }else{
+                    do{
+                        he = he.ELleft;
+                    }while(he != ELleftend && !right(he, (newsite.coord)));
+                }
+
+                if(bucket > 0 && bucket < ELhashsize - 1){
+                    ELhash[bucket] = he;
+                }
+                lbnd = he;
+                rbnd = lbnd.ELright;
+
+                bot = rightreg(lbnd);
+                e = bisect(bot, newsite);
+
+                bisector = newHe(e, LE);
+                insert(lbnd, bisector);
+
+                if((p = intersect(lbnd, bisector)) != null){
+                    pqdelete(lbnd);
+                    pqinsert(lbnd, p, p.coord.dst(newsite.coord));
+                }
+                lbnd = bisector;
+                bisector = newHe(e, RE);
+                insert(lbnd, bisector);
+
+                if((p = intersect(bisector, rbnd)) != null){
+                    pqinsert(bisector, p, p.coord.dst(newsite.coord));
+                }
+                newsite = next();
+            }else if(!(PQcount == 0)){
+                Halfedge curr;
+
+                curr = PQhash[PQmin].PQnext;
+                PQhash[PQmin].PQnext = curr.PQnext;
+                PQcount -= 1;
+                lbnd = (curr);
+                Halfedge llbnd = lbnd.ELleft;
+                rbnd = lbnd.ELright;
+                Halfedge rrbnd = (rbnd.ELright);
+                bot = leftReg(lbnd);
+                Site top = rightreg(rbnd);
+
+                Site v = lbnd.vertex;
+                v.sitenbr = nvertices;
+                nvertices += 1;
+                endpoint(lbnd.ELedge, lbnd.ELpm, v);
+                endpoint(rbnd.ELedge, rbnd.ELpm, v);
+                delete(lbnd);
+                pqdelete(rbnd);
+                delete(rbnd);
+                int pm = LE;
+
+                if(bot.coord.y > top.coord.y){
+                    Site temp1 = bot;
+                    bot = top;
+                    top = temp1;
+                    pm = RE;
+                }
+
+                e = bisect(bot, top);
+                bisector = newHe(e, pm);
+                insert(llbnd, bisector);
+                endpoint(e, RE - pm, v);
+
+                if((p = intersect(llbnd, bisector)) != null){
+                    pqdelete(llbnd);
+                    pqinsert(llbnd, p, p.coord.dst(bot.coord));
+                }
+
+                if((p = intersect(bisector, rrbnd)) != null){
+                    pqinsert(bisector, p, p.coord.dst(bot.coord));
+                }
+            }else{
+                break;
+            }
+        }
+
+        for(lbnd = (ELleftend.ELright); lbnd != ELrightend; lbnd = (lbnd.ELright)){
+            e = lbnd.ELedge;
+            clipLine(e);
+        }
+
+        return allEdges;
+    }
+
+    private Site next(){
+        return siteidx < nsites ? sites[siteidx ++] : null;
+    }
+
+    private Edge bisect(Site s1, Site s2){
+        Edge newedge = new Edge();
+
+        // store the sites that this edge is bisecting
+        newedge.reg[0] = s1;
+        newedge.reg[1] = s2;
+        // to begin with, there are no endpoints on the bisector - it goes to
+        // infinity
+        newedge.ep[0] = null;
+        newedge.ep[1] = null;
+
+        // get the difference in x dist between the sites
+        float dx = s2.coord.x - s1.coord.x;
+        float dy = s2.coord.y - s1.coord.y;
+        // make sure that the difference in positive
+        float adx = dx > 0 ? dx : -dx;
+        float ady = dy > 0 ? dy : -dy;
+        newedge.c = s1.coord.x * dx + s1.coord.y * dy + (dx * dx + dy * dy) * 0.5f;// get the slope of the line
+
+        if(adx > ady){
+            newedge.a = 1.0f;
+            newedge.b = dy / dx;
+            newedge.c /= dx;// set formula of line, with x fixed to 1
+        }else{
+            newedge.b = 1.0f;
+            newedge.a = dx / dy;
+            newedge.c /= dy;// set formula of line, with y fixed to 1
+        }
+
+        newedge.edgenbr = nedges;
+
+        nedges += 1;
+        return newedge;
+    }
+
+    private int pqbucket(Halfedge he){
+        int bucket;
+
+        bucket = (int)((he.ystar - ymin) / deltay * PQhashsize);
+        if(bucket < 0){
+            bucket = 0;
+        }
+        if(bucket >= PQhashsize){
+            bucket = PQhashsize - 1;
+        }
+        if(bucket < PQmin){
+            PQmin = bucket;
+        }
+        return bucket;
+    }
+
+    // push the HalfEdge into the ordered linked list of vertices
+    private void pqinsert(Halfedge he, Site v, float offset){
+        Halfedge last, next;
+
+        he.vertex = v;
+        he.ystar = v.coord.y + offset;
+        last = PQhash[pqbucket(he)];
+        while((next = last.PQnext) != null
+        && (he.ystar > next.ystar || (he.ystar == next.ystar && v.coord.x > next.vertex.coord.x))){
+            last = next;
+        }
+        he.PQnext = last.PQnext;
+        last.PQnext = he;
+        PQcount += 1;
+    }
+
+    // remove the HalfEdge from the list of vertices
+    private void pqdelete(Halfedge he){
+        Halfedge last;
+
+        if(he.vertex != null){
+            last = PQhash[pqbucket(he)];
+            while(last.PQnext != he){
+                last = last.PQnext;
+            }
+
+            last.PQnext = he.PQnext;
+            PQcount -= 1;
+            he.vertex = null;
+        }
+    }
+
+    private Halfedge newHe(Edge e, int pm){
+        Halfedge answer = new Halfedge();
+        answer.ELedge = e;
+        answer.ELpm = pm;
+        answer.PQnext = null;
+        answer.vertex = null;
+        return answer;
+    }
+
+    private Site leftReg(Halfedge he){
+        if(he.ELedge == null){
+            return bottomsite;
+        }
+        return he.ELpm == LE ? he.ELedge.reg[LE] : he.ELedge.reg[RE];
+    }
+
+    private void insert(Halfedge lb, Halfedge newHe){
+        newHe.ELleft = lb;
+        newHe.ELright = lb.ELright;
+        lb.ELright.ELleft = newHe;
+        lb.ELright = newHe;
+    }
+
+    /*
+     * This delete routine can't reclaim node, since pointers from hash table
+     * may be present.
+     */
+    private void delete(Halfedge he){
+        he.ELleft.ELright = he.ELright;
+        he.ELright.ELleft = he.ELleft;
+        he.deleted = true;
+    }
+
+    /* Get entry from hash table, pruning any deleted nodes */
+    private Halfedge getHash(int b){
+        Halfedge he;
+
+        if(b < 0 || b >= ELhashsize){
+            return (null);
+        }
+        he = ELhash[b];
+        if(he == null || !he.deleted){
+            return (he);
+        }
+
+        /* Hash table points to deleted half edge. Patch as necessary. */
+        ELhash[b] = null;
+        return (null);
+    }
+
+    private void clipLine(Edge e){
+        float pxmin, pxmax, pymin, pymax;
+        Site s1, s2;
+        float x1 = 0, x2 = 0, y1 = 0, y2 = 0;
+
+        x1 = e.reg[0].coord.x;
+        x2 = e.reg[1].coord.x;
+        y1 = e.reg[0].coord.y;
+        y2 = e.reg[1].coord.y;
+
+        // if the distance between the two points this line was created from is
+        // less than the square root of 2, then ignore it
+        if(Math.sqrt(((x2 - x1) * (x2 - x1)) + ((y2 - y1) * (y2 - y1))) < minDistanceBetweenSites){
+            return;
+        }
+        pxmin = borderMinX;
+        pxmax = borderMaxX;
+        pymin = borderMinY;
+        pymax = borderMaxY;
+
+        if(e.a == 1.0 && e.b >= 0.0){
+            s1 = e.ep[1];
+            s2 = e.ep[0];
+        }else{
+            s1 = e.ep[0];
+            s2 = e.ep[1];
+        }
+
+        if(e.a == 1.0){
+            y1 = pymin;
+            if(s1 != null && s1.coord.y > pymin){
+                y1 = s1.coord.y;
+            }
+            if(y1 > pymax){
+                y1 = pymax;
+            }
+            x1 = e.c - e.b * y1;
+            y2 = pymax;
+            if(s2 != null && s2.coord.y < pymax){
+                y2 = s2.coord.y;
+            }
+
+            if(y2 < pymin){
+                y2 = pymin;
+            }
+            x2 = (e.c) - (e.b) * y2;
+            if(((x1 > pxmax) & (x2 > pxmax)) | ((x1 < pxmin) & (x2 < pxmin))){
+                return;
+            }
+            if(x1 > pxmax){
+                x1 = pxmax;
+                y1 = (e.c - x1) / e.b;
+            }
+            if(x1 < pxmin){
+                x1 = pxmin;
+                y1 = (e.c - x1) / e.b;
+            }
+            if(x2 > pxmax){
+                x2 = pxmax;
+                y2 = (e.c - x2) / e.b;
+            }
+            if(x2 < pxmin){
+                x2 = pxmin;
+                y2 = (e.c - x2) / e.b;
+            }
+        }else{
+            x1 = pxmin;
+            if(s1 != null && s1.coord.x > pxmin){
+                x1 = s1.coord.x;
+            }
+            if(x1 > pxmax){
+                x1 = pxmax;
+            }
+            y1 = e.c - e.a * x1;
+            x2 = pxmax;
+            if(s2 != null && s2.coord.x < pxmax){
+                x2 = s2.coord.x;
+            }
+            if(x2 < pxmin){
+                x2 = pxmin;
+            }
+            y2 = e.c - e.a * x2;
+            if(((y1 > pymax) & (y2 > pymax)) | ((y1 < pymin) & (y2 < pymin))){
+                return;
+            }
+            if(y1 > pymax){
+                y1 = pymax;
+                x1 = (e.c - y1) / e.a;
+            }
+            if(y1 < pymin){
+                y1 = pymin;
+                x1 = (e.c - y1) / e.a;
+            }
+            if(y2 > pymax){
+                y2 = pymax;
+                x2 = (e.c - y2) / e.a;
+            }
+            if(y2 < pymin){
+                y2 = pymin;
+                x2 = (e.c - y2) / e.a;
+            }
+        }
+
+        GraphEdge newEdge = new GraphEdge();
+        allEdges.add(newEdge);
+        newEdge.x1 = x1;
+        newEdge.y1 = y1;
+        newEdge.x2 = x2;
+        newEdge.y2 = y2;
+
+        newEdge.site1 = e.reg[0].sitenbr;
+        newEdge.site2 = e.reg[1].sitenbr;
+    }
+
+    private void endpoint(Edge e, int lr, Site s){
+        e.ep[lr] = s;
+        if(e.ep[RE - lr] == null){
+            return;
+        }
+        clipLine(e);
+    }
+
+    private boolean right(Halfedge el, Vec2 p){
+        Edge e = el.ELedge;
+        Site topsite = e.reg[1];
+        boolean rightOf = p.x > topsite.coord.x;
+        if(rightOf && el.ELpm == LE){
+            return true;
+        }
+        if(!rightOf && el.ELpm == RE){
+            return false;
+        }
+
+        boolean above;
+        if(e.a == 1.0){
+            float dyp = p.y - topsite.coord.y;
+            float dxp = p.x - topsite.coord.x;
+            boolean fast = false;
+            if((!rightOf & (e.b < 0.0)) | (rightOf & (e.b >= 0.0))){
+                above = dyp >= e.b * dxp;
+                fast = above;
+            }else{
+                above = p.x + p.y * e.b > e.c;
+                if(e.b < 0.0){
+                    above = !above;
+                }
+                if(!above){
+                    fast = true;
+                }
+            }
+            if(!fast){
+                float dxs = topsite.coord.x - (e.reg[0]).coord.x;
+                above = e.b * (dxp * dxp - dyp * dyp) < dxs * dyp
+                * (1.0 + 2.0 * dxp / dxs + e.b * e.b);
+                if(e.b < 0.0){
+                    above = !above;
+                }
+            }
+        }else{
+            float yl = e.c - e.a * p.x;
+            float t1 = p.y - yl;
+            float t2 = p.x - topsite.coord.x;
+            float t3 = yl - topsite.coord.y;
+            above = t1 * t1 > t2 * t2 + t3 * t3;
+        }
+        return ((el.ELpm == LE) == above);
+    }
+
+    private Site rightreg(Halfedge he){
+        if(he.ELedge == null) return bottomsite;
+
+        return (he.ELpm == LE ? he.ELedge.reg[RE] : he.ELedge.reg[LE]);
+    }
+
+    private Site intersect(Halfedge el1, Halfedge el2){
+        Edge e1, e2, e;
+        Halfedge el;
+        float d, xint, yint;
+        boolean right_of_site;
+        Site v;
+
+        e1 = el1.ELedge;
+        e2 = el2.ELedge;
+        if(e1 == null || e2 == null){
+            return null;
+        }
+
+        if(e1.reg[1] == e2.reg[1]){
+            return null;
+        }
+
+        d = e1.a * e2.b - e1.b * e2.a;
+        if(-1.0e-10 < d && d < 1.0e-10){
+            return null;
+        }
+
+        xint = (e1.c * e2.b - e2.c * e1.b) / d;
+        yint = (e2.c * e1.a - e1.c * e2.a) / d;
+
+        if((e1.reg[1].coord.y < e2.reg[1].coord.y)
+        || (e1.reg[1].coord.y == e2.reg[1].coord.y && e1.reg[1].coord.x < e2.reg[1].coord.x)){
+            el = el1;
+            e = e1;
+        }else{
+            el = el2;
+            e = e2;
+        }
+
+        right_of_site = xint >= e.reg[1].coord.x;
+        if((right_of_site && el.ELpm == LE)
+        || (!right_of_site && el.ELpm == RE)){
+            return null;
+        }
+
+        v = new Site();
+        v.coord.x = xint;
+        v.coord.y = yint;
+        return (v);
+    }
+
+    static class Site{
+        Vec2 coord = new Vec2();
+        int sitenbr;
+    }
+
+    static class Halfedge{
+        Halfedge ELleft, ELright;
+        Edge ELedge;
+        boolean deleted;
+        int ELpm;
+        Site vertex;
+        float ystar;
+        Halfedge PQnext;
+    }
+
+    public static class GraphEdge{
+        public float x1, y1, x2, y2;
+
+        public int site1, site2;
+    }
+
+    static class Edge{
+        float a = 0, b = 0, c = 0;
+        Site[] ep = new Site[2];
+        Site[] reg = new Site[2];
+        int edgenbr;
+    }
+}
diff --git a/core/src/mindustry/maps/Maps.java b/core/src/mindustry/maps/Maps.java
index d7ea3b392d..72fcc09aa1 100644
--- a/core/src/mindustry/maps/Maps.java
+++ b/core/src/mindustry/maps/Maps.java
@@ -29,9 +29,9 @@ import static mindustry.Vars.*;
 
 public class Maps{
     /** List of all built-in maps. Filenames only. */
-    private static String[] defaultMapNames = {"maze", "fortress", "labyrinth", "islands", "tendrils", "caldera", "wasteland", "shattered", "fork", "triad", "mudFlats", "moltenLake", "archipelago", "debrisField", "veins", "glacier"};
+    private static String[] defaultMapNames = {"maze", "fortress", "labyrinth", "islands", "tendrils", "caldera", "wasteland", "shattered", "fork", "triad", "mudFlats", "moltenLake", "archipelago", "debrisField", "veins", "glacier", "passage"};
     /** Maps tagged as PvP */
-    static final String[] pvpMaps = {"veins", "glacier"};
+    static final String[] pvpMaps = {"veins", "glacier", "passage"};
     /** All maps stored in an ordered array. */
     private Seq<Map> maps = new Seq<>();
     /** Serializer for meta. */
diff --git a/core/src/mindustry/maps/filters/ClearFilter.java b/core/src/mindustry/maps/filters/ClearFilter.java
index 3b2684ef7e..59e4512a82 100644
--- a/core/src/mindustry/maps/filters/ClearFilter.java
+++ b/core/src/mindustry/maps/filters/ClearFilter.java
@@ -7,12 +7,14 @@ import mindustry.world.*;
 import static mindustry.maps.filters.FilterOption.*;
 
 public class ClearFilter extends GenerateFilter{
-    protected Block block = Blocks.air;
+    protected Block target = Blocks.stone;
+    protected Block replace = Blocks.air;
 
     @Override
     public FilterOption[] options(){
         return new BlockOption[]{
-            new BlockOption("block", () -> block, b -> block = b, b -> oresOnly.get(b) || wallsOnly.get(b))
+            new BlockOption("target", () -> target, b -> target = b, anyOptional),
+            new BlockOption("replacement", () -> replace, b -> replace = b, anyOptional)
         };
     }
 
@@ -24,12 +26,21 @@ public class ClearFilter extends GenerateFilter{
     @Override
     public void apply(GenerateInput in){
 
-        if(in.block == block){
-            in.block = Blocks.air;
-        }
-
-        if(in.overlay == block){
-            in.overlay = Blocks.air;
+        if(in.block == target || in.floor == target || (target.isOverlay() && in.overlay == target)){
+            //special case: when air is the result, replace only the overlay or wall
+            if(replace == Blocks.air){
+                if(in.overlay == target){
+                    in.overlay = Blocks.air;
+                }else{
+                    in.block = Blocks.air;
+                }
+            }else if(replace.isOverlay()){ //replace the best match based on type
+                in.overlay = replace;
+            }else if(replace.isFloor()){
+                in.floor = replace;
+            }else{
+                in.block = replace;
+            }
         }
     }
 }
diff --git a/core/src/mindustry/mod/ClassMap.java b/core/src/mindustry/mod/ClassMap.java
index 2b34e5bbb5..de033c0e9a 100644
--- a/core/src/mindustry/mod/ClassMap.java
+++ b/core/src/mindustry/mod/ClassMap.java
@@ -1,6 +1,7 @@
 package mindustry.mod;
 
 import arc.struct.*;
+import mindustry.world.blocks.environment.*;
 import mindustry.world.blocks.payloads.*;
 
 /** Generated class. Maps simple class names to concrete classes. For use in JSON mods. */
@@ -173,8 +174,11 @@ public class ClassMap{
         classes.put("OreBlock", mindustry.world.blocks.environment.OreBlock.class);
         classes.put("OverlayFloor", mindustry.world.blocks.environment.OverlayFloor.class);
         classes.put("Prop", mindustry.world.blocks.environment.Prop.class);
+        classes.put("Bush", Bush.class);
+        classes.put("WavingProp", WavingProp.class);
         classes.put("ShallowLiquid", mindustry.world.blocks.environment.ShallowLiquid.class);
         classes.put("SpawnBlock", mindustry.world.blocks.environment.SpawnBlock.class);
+        classes.put("StaticClusterWall", StaticClusterWall.class);
         classes.put("StaticTree", mindustry.world.blocks.environment.StaticTree.class);
         classes.put("StaticWall", mindustry.world.blocks.environment.StaticWall.class);
         classes.put("TreeBlock", mindustry.world.blocks.environment.TreeBlock.class);
diff --git a/core/src/mindustry/ui/dialogs/CustomRulesDialog.java b/core/src/mindustry/ui/dialogs/CustomRulesDialog.java
index 6c763e840b..aa19947d54 100644
--- a/core/src/mindustry/ui/dialogs/CustomRulesDialog.java
+++ b/core/src/mindustry/ui/dialogs/CustomRulesDialog.java
@@ -170,7 +170,8 @@ public class CustomRulesDialog extends BaseDialog{
         check("@rules.attack", b -> rules.attackMode = b, () -> rules.attackMode);
         check("@rules.buildai", b -> rules.teams.get(rules.waveTeam).ai = rules.teams.get(rules.waveTeam).infiniteResources = b, () -> rules.teams.get(rules.waveTeam).ai);
         check("@rules.corecapture", b -> rules.coreCapture = b, () -> rules.coreCapture);
-        number("@rules.enemycorebuildradius", f -> rules.enemyCoreBuildRadius = f * tilesize, () -> Math.min(rules.enemyCoreBuildRadius / tilesize, 200));
+        check("@rules.polygoncoreprotection", b -> rules.polygonCoreProtection = b, () -> rules.polygonCoreProtection);
+        number("@rules.enemycorebuildradius", f -> rules.enemyCoreBuildRadius = f * tilesize, () -> Math.min(rules.enemyCoreBuildRadius / tilesize, 200), () -> !rules.polygonCoreProtection);
 
         title("@rules.title.environment");
         check("@rules.explosions", b -> rules.damageExplosions = b, () -> rules.damageExplosions);
diff --git a/core/src/mindustry/world/Block.java b/core/src/mindustry/world/Block.java
index 11eb6b3bef..6e2e2c1afc 100644
--- a/core/src/mindustry/world/Block.java
+++ b/core/src/mindustry/world/Block.java
@@ -229,6 +229,8 @@ public class Block extends UnlockableContent{
     public boolean instantDeconstruct = false;
     /** Effect for breaking the block. Passes size as rotation. */
     public Effect breakEffect = Fx.breakBlock;
+    /** Effect for destroying the block. */
+    public Effect destroyEffect = Fx.dynamicExplosion;
     /** Multiplier for cost of research in tech tree. */
     public float researchCostMultiplier = 1;
     /** Whether this block has instant transfer.*/
diff --git a/core/src/mindustry/world/Build.java b/core/src/mindustry/world/Build.java
index b873546340..0069ea0f56 100644
--- a/core/src/mindustry/world/Build.java
+++ b/core/src/mindustry/world/Build.java
@@ -10,9 +10,11 @@ import mindustry.content.*;
 import mindustry.entities.*;
 import mindustry.game.EventType.*;
 import mindustry.game.*;
+import mindustry.game.Teams.*;
 import mindustry.gen.*;
 import mindustry.world.blocks.*;
 import mindustry.world.blocks.ConstructBlock.*;
+import mindustry.world.blocks.storage.CoreBlock.*;
 
 import static mindustry.Vars.*;
 
@@ -132,7 +134,23 @@ public class Build{
             return false;
         }
 
-        if(state.teams.eachEnemyCore(team, core -> Mathf.dst(x * tilesize + type.offset, y * tilesize + type.offset, core.x, core.y) < state.rules.enemyCoreBuildRadius + type.size * tilesize / 2f)){
+        //find closest core, if it doesn't match the team, placing is not legal
+        if(state.rules.polygonCoreProtection){
+            float mindst = Float.MAX_VALUE;
+            CoreBuild closest = null;
+            for(TeamData data : state.teams.active){
+                for(CoreBuild tile : data.cores){
+                    float dst = tile.dst2(x * tilesize + type.offset, y * tilesize + type.offset);
+                    if(dst < mindst){
+                        closest = tile;
+                        mindst = dst;
+                    }
+                }
+            }
+            if(closest != null && closest.team != team){
+                return false;
+            }
+        }else if(state.teams.eachEnemyCore(team, core -> Mathf.dst(x * tilesize + type.offset, y * tilesize + type.offset, core.x, core.y) < state.rules.enemyCoreBuildRadius + type.size * tilesize / 2f)){
             return false;
         }
 
diff --git a/core/src/mindustry/world/blocks/power/ImpactReactor.java b/core/src/mindustry/world/blocks/power/ImpactReactor.java
index d692699100..64e94d8c14 100644
--- a/core/src/mindustry/world/blocks/power/ImpactReactor.java
+++ b/core/src/mindustry/world/blocks/power/ImpactReactor.java
@@ -26,6 +26,7 @@ public class ImpactReactor extends PowerGenerator{
     public float itemDuration = 60f;
     public int explosionRadius = 23;
     public int explosionDamage = 1900;
+    public Effect explodeEffect = Fx.impactReactorExplosion;
 
     public Color plasma1 = Color.valueOf("ffd06b"), plasma2 = Color.valueOf("ff361b");
 
@@ -137,32 +138,14 @@ public class ImpactReactor extends PowerGenerator{
         public void onDestroyed(){
             super.onDestroyed();
 
-            if(warmup < 0.4f || !state.rules.reactorExplosions) return;
+            if(warmup < 0.3f || !state.rules.reactorExplosions) return;
 
             Sounds.explosionbig.at(tile);
 
-            Effect.shake(6f, 16f, x, y);
-            Fx.impactShockwave.at(x, y);
-            for(int i = 0; i < 6; i++){
-                Time.run(Mathf.random(80), () -> Fx.impactcloud.at(x, y));
-            }
-
             Damage.damage(x, y, explosionRadius * tilesize, explosionDamage * 4);
 
-
-            for(int i = 0; i < 20; i++){
-                Time.run(Mathf.random(80), () -> {
-                    Tmp.v1.rnd(Mathf.random(40f));
-                    Fx.explosion.at(Tmp.v1.x + x, Tmp.v1.y + y);
-                });
-            }
-
-            for(int i = 0; i < 70; i++){
-                Time.run(Mathf.random(90), () -> {
-                    Tmp.v1.rnd(Mathf.random(120f));
-                    Fx.impactsmoke.at(Tmp.v1.x + x, Tmp.v1.y + y);
-                });
-            }
+            Effect.shake(6f, 16f, x, y);
+            explodeEffect.at(x, y);
         }
 
         @Override
diff --git a/core/src/mindustry/world/blocks/storage/CoreBlock.java b/core/src/mindustry/world/blocks/storage/CoreBlock.java
index a5d61237e3..52844719d7 100644
--- a/core/src/mindustry/world/blocks/storage/CoreBlock.java
+++ b/core/src/mindustry/world/blocks/storage/CoreBlock.java
@@ -194,6 +194,20 @@ public class CoreBlock extends StorageBlock{
             super.damage(source, damage);
         }
 
+        @Override
+        public void created(){
+            super.created();
+
+            Events.fire(new CoreChangeEvent(this));
+        }
+
+        @Override
+        public void changeTeam(Team next){
+            super.changeTeam(next);
+
+            Events.fire(new CoreChangeEvent(this));
+        }
+
         @Override
         public double sense(LAccess sensor){
             if(sensor == LAccess.itemCapacity) return storageCapacity;
@@ -260,6 +274,8 @@ public class CoreBlock extends StorageBlock{
                     spawner.getSpawns().add(tile);
                 }
             }
+
+            Events.fire(new CoreChangeEvent(this));
         }
 
         @Override
diff --git a/gradle.properties b/gradle.properties
index 15947e3eac..133a6a5351 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -10,4 +10,4 @@ kapt.include.compile.classpath=false
 kotlin.stdlib.default.dependency=false
 #needed for android compilation
 android.useAndroidX=true
-archash=07ced971f4c8b8b5a61aa3a84b29c90aa497cb48
+archash=df2786dd8de1ebc1b70c453d6dcac62c2ecf9e18