diff --git a/core/assets/maps/two.msav b/core/assets/maps/two.msav
index 85399dc349..b5782042e7 100644
Binary files a/core/assets/maps/two.msav and b/core/assets/maps/two.msav differ
diff --git a/core/src/mindustry/ai/BlockIndexer.java b/core/src/mindustry/ai/BlockIndexer.java
index 333c5d6b4f..81c7a8457d 100644
--- a/core/src/mindustry/ai/BlockIndexer.java
+++ b/core/src/mindustry/ai/BlockIndexer.java
@@ -356,9 +356,9 @@ public class BlockIndexer{
             float dist = candidate.dst(x, y) - candidate.hitSize() / 2f;
             if(target == null ||
             //if its closer and is at least equal priority
-            (dist < targetDist && candidate.block.priority.ordinal() >= target.block.priority.ordinal()) ||
+            (dist < targetDist && candidate.block.priority >= target.block.priority) ||
             // block has higher priority (so range doesnt matter)
-            (candidate.block.priority.ordinal() > target.block.priority.ordinal())){
+            (candidate.block.priority > target.block.priority)){
                 target = candidate;
                 targetDist = dist;
             }
@@ -388,9 +388,9 @@ public class BlockIndexer{
             float bdst = next.dst(x, y) - next.hitSize() / 2f;
             if(bdst < range && (closest == null ||
             //this one is closer, and it is at least of equal priority
-            (bdst < dst && (!usePriority || closest.block.priority.ordinal() <= next.block.priority.ordinal())) ||
+            (bdst < dst && (!usePriority || closest.block.priority <= next.block.priority)) ||
             //priority is used, and new block has higher priority regardless of range
-            (usePriority && closest.block.priority.ordinal() < next.block.priority.ordinal()))){
+            (usePriority && closest.block.priority < next.block.priority))){
                 dst = bdst;
                 closest = next;
             }
diff --git a/core/src/mindustry/ai/Pathfinder.java b/core/src/mindustry/ai/Pathfinder.java
index 05b6ec0a5f..2b81119e12 100644
--- a/core/src/mindustry/ai/Pathfinder.java
+++ b/core/src/mindustry/ai/Pathfinder.java
@@ -131,7 +131,7 @@ public class Pathfinder implements Runnable{
                                 }
                             }
                             //the other tile is no longer near solid, remove the solid bit
-                            if(!otherNearSolid){
+                            if(!otherNearSolid && tiles.length > other.array()){
                                 tiles[other.array()] &= ~(PathTile.bitMaskNearSolid);
                             }
                         }
diff --git a/core/src/mindustry/content/Fx.java b/core/src/mindustry/content/Fx.java
index b635288352..4a048b97f9 100644
--- a/core/src/mindustry/content/Fx.java
+++ b/core/src/mindustry/content/Fx.java
@@ -182,6 +182,22 @@ public class Fx{
         }
     }),
 
+    coreBuildShockwave = new Effect(120, 500f, e -> {
+        e.lifetime = e.rotation;
+
+        color(Pal.command);
+        stroke(e.fout(Interp.pow5Out) * 4f);
+        Lines.circle(e.x, e.y, e.fin() * e.rotation);
+    }),
+
+    coreBuildBlock = new Effect(80f, e -> {
+        if(!(e.data instanceof Block block)) return;
+
+        mixcol(Pal.accent, 1f);
+        alpha(e.fout());
+        rect(block.fullIcon, e.x, e.y);
+    }).layer(Layer.turret - 5f),
+
     moveCommand = new Effect(20, e -> {
         color(Pal.command);
         stroke(e.fout() * 5f);
diff --git a/core/src/mindustry/content/Planets.java b/core/src/mindustry/content/Planets.java
index af7d055650..a68fd079e2 100644
--- a/core/src/mindustry/content/Planets.java
+++ b/core/src/mindustry/content/Planets.java
@@ -72,9 +72,9 @@ public class Planets{
                 r.attributes.set(Attribute.heat, 0.8f);
                 r.showSpawns = true;
                 r.fog = true;
-                r.staticFog = true; //TODO decide, is this a good idea?
+                r.staticFog = true;
                 r.lighting = false;
-                r.onlyDepositCore = true;
+                r.onlyDepositCore = true; //TODO not sure
             };
 
             unlockedOnLand.add(Blocks.coreBastion);
diff --git a/core/src/mindustry/core/Control.java b/core/src/mindustry/core/Control.java
index 4b8a2f0b2e..0196147dcc 100644
--- a/core/src/mindustry/core/Control.java
+++ b/core/src/mindustry/core/Control.java
@@ -30,6 +30,7 @@ import mindustry.net.*;
 import mindustry.type.*;
 import mindustry.ui.dialogs.*;
 import mindustry.world.*;
+import mindustry.world.blocks.storage.CoreBlock.*;
 
 import java.io.*;
 import java.text.*;
@@ -207,7 +208,10 @@ public class Control implements ApplicationListener, Loadable{
             camera.position.set(core);
             player.set(core);
 
+            float coreDelay = 0f;
+
             if(!settings.getBool("skipcoreanimation")){
+                coreDelay = coreLandDuration;
                 //delay player respawn so animation can play.
                 player.deathTimer = -80f;
                 //TODO this sounds pretty bad due to conflict
@@ -232,6 +236,47 @@ public class Control implements ApplicationListener, Loadable{
                     }
                 });
             }
+
+            if(state.isCampaign()){
+
+                //TODO add a delay for landing.
+                if(state.rules.sector.planet.prebuildBase){
+                    float unitsPerTick = 1f;
+
+                    boolean anyBuilds = false;
+                    for(Tile tile : world.tiles){
+                        var build = tile.build;
+                        if(!(build instanceof CoreBuild) && build != null && build.team == state.rules.defaultTeam){
+                            var ccore = build.closestCore();
+
+                            if(ccore != null && build.within(ccore, state.rules.enemyCoreBuildRadius)){
+                                build.pickedUp();
+                                build.tile.remove();
+                                anyBuilds = true;
+
+                                Time.run(build.dst(ccore) * unitsPerTick + coreDelay, () -> {
+                                    //TODO instance reuse bad?
+                                    build.tile.setBlock(build.block, build.team, build.rotation, () -> build);
+
+                                    //TODO dropped bad?
+                                    build.dropped();
+
+                                    Fx.coreBuildBlock.at(build.x, build.y, 0f, build.block);
+                                    Fx.placeBlock.at(build.x, build.y, build.block.size);
+                                });
+                            }
+                        }
+                    }
+
+                    if(anyBuilds){
+                        for(var ccore : state.rules.defaultTeam.data().cores){
+                            Time.run(coreDelay, () -> {
+                                Fx.coreBuildShockwave.at(ccore.x, ccore.y, state.rules.enemyCoreBuildRadius);
+                            });
+                        }
+                    }
+                }
+            }
         });
 
     }
diff --git a/core/src/mindustry/core/Logic.java b/core/src/mindustry/core/Logic.java
index f4a2780551..3074080e4b 100644
--- a/core/src/mindustry/core/Logic.java
+++ b/core/src/mindustry/core/Logic.java
@@ -126,7 +126,7 @@ public class Logic implements ApplicationListener{
                 state.rules.coreIncinerates = true;
                 state.rules.waveTeam.rules().infiniteResources = true;
 
-                //fill enemy cores by default.
+                //fill enemy cores by default? TODO decide
                 for(var core : state.rules.waveTeam.cores()){
                     for(Item item : content.items()){
                         core.items.set(item, core.block.itemCapacity);
diff --git a/core/src/mindustry/entities/TargetPriority.java b/core/src/mindustry/entities/TargetPriority.java
index b8b9757961..9528ae4a75 100644
--- a/core/src/mindustry/entities/TargetPriority.java
+++ b/core/src/mindustry/entities/TargetPriority.java
@@ -1,8 +1,10 @@
 package mindustry.entities;
 
-/** A higher ordinal means a higher priority. Higher priority blocks will always get targeted over those of lower priority, regardless of distance. */
-public enum TargetPriority{
-    base,
-    turret,
-    core
+/** Higher priority blocks will always get targeted over those of lower priority, regardless of distance. */
+public class TargetPriority{
+    public static final float
+    base = 0f,
+    constructing = 1f,
+    turret = 2f,
+    core = 3f;
 }
diff --git a/core/src/mindustry/entities/comp/BuildingComp.java b/core/src/mindustry/entities/comp/BuildingComp.java
index 8f9ff64f31..ed6501348a 100644
--- a/core/src/mindustry/entities/comp/BuildingComp.java
+++ b/core/src/mindustry/entities/comp/BuildingComp.java
@@ -264,7 +264,11 @@ abstract class BuildingComp implements Posc, Teamc, Healthc, Buildingc, Timerc,
     //region utility methods
 
     public void addPlan(boolean checkPrevious){
-        if(!block.rebuildable || (team == state.rules.defaultTeam && state.isCampaign() && !block.isVisible())) return;
+        addPlan(checkPrevious, false);
+    }
+
+    public void addPlan(boolean checkPrevious, boolean ignoreConditions){
+        if(!ignoreConditions && (!block.rebuildable || (team == state.rules.defaultTeam && state.isCampaign() && !block.isVisible()))) return;
 
         Object overrideConfig = null;
 
diff --git a/core/src/mindustry/type/Planet.java b/core/src/mindustry/type/Planet.java
index 4d3d6f645e..49606742ff 100644
--- a/core/src/mindustry/type/Planet.java
+++ b/core/src/mindustry/type/Planet.java
@@ -95,6 +95,8 @@ public class Planet extends UnlockableContent{
     public boolean allowSectorInvasion = false;
     /** If true, sectors saves are cleared when lost. */
     public boolean clearSectorOnLose = false;
+    /** If true, blocks in the radius of the core will be removed and "built up" in a shockwave upon landing. */
+    public boolean prebuildBase = true;
     /** If true, waves are created on sector loss. TODO remove. */
     public boolean allowWaves = false;
     /** Sets up rules on game load for any sector on this planet. */
diff --git a/core/src/mindustry/world/Block.java b/core/src/mindustry/world/Block.java
index 8b24f851f6..5b035bffb6 100644
--- a/core/src/mindustry/world/Block.java
+++ b/core/src/mindustry/world/Block.java
@@ -178,8 +178,8 @@ public class Block extends UnlockableContent implements Senseable{
     public BlockGroup group = BlockGroup.none;
     /** List of block flags. Used for AI indexing. */
     public EnumSet<BlockFlag> flags = EnumSet.of();
-    /** Targeting priority of this block, as seen by enemies .*/
-    public TargetPriority priority = TargetPriority.base;
+    /** Targeting priority of this block, as seen by enemies. */
+    public float priority = TargetPriority.base;
     /** How much this block affects the unit cap by.
      * The block flags must contain unitModifier in order for this to work. */
     public int unitCapModifier = 0;
diff --git a/core/src/mindustry/world/blocks/ConstructBlock.java b/core/src/mindustry/world/blocks/ConstructBlock.java
index a5f220b9b8..1686383977 100644
--- a/core/src/mindustry/world/blocks/ConstructBlock.java
+++ b/core/src/mindustry/world/blocks/ConstructBlock.java
@@ -44,6 +44,7 @@ public class ConstructBlock extends Block{
         inEditor = false;
         consBlocks[size - 1] = this;
         sync = true;
+        priority = TargetPriority.constructing;
     }
 
     /** Returns a ConstructBlock by size. */