diff --git a/core/src/mindustry/ai/types/SuicideAI.java b/core/src/mindustry/ai/types/SuicideAI.java
index 7278062605..789fb93f4b 100644
--- a/core/src/mindustry/ai/types/SuicideAI.java
+++ b/core/src/mindustry/ai/types/SuicideAI.java
@@ -6,6 +6,8 @@ import mindustry.entities.*;
 import mindustry.entities.units.*;
 import mindustry.gen.*;
 import mindustry.world.*;
+import mindustry.world.blocks.distribution.*;
+import mindustry.world.blocks.liquid.*;
 import mindustry.world.meta.*;
 
 public class SuicideAI extends GroundAI{
@@ -14,7 +16,7 @@ public class SuicideAI extends GroundAI{
     @Override
     public void updateUnit(){
 
-        if(Units.invalidateTarget(target, unit.team(), unit.x(), unit.y(), Float.MAX_VALUE)){
+        if(Units.invalidateTarget(target, unit.team, unit.x, unit.y, Float.MAX_VALUE)){
             target = null;
         }
 
@@ -35,29 +37,32 @@ public class SuicideAI extends GroundAI{
                 unit.aimLook(Predict.intercept(unit, target, unit.type().weapons.first().bullet.speed));
             }
 
-            blockedByBlock = false;
+            //do not move toward walls or transport blocks
+            if(!(target instanceof Building build && (build.block.group == BlockGroup.walls || build.block.group == BlockGroup.liquids || build.block.group == BlockGroup.transportation))){
+                blockedByBlock = false;
 
-            //raycast for target
-            boolean blocked = Vars.world.raycast(unit.tileX(), unit.tileY(), target.tileX(), target.tileY(), (x, y) -> {
-                Tile tile = Vars.world.tile(x, y);
-                if(tile != null && tile.build == target) return false;
-                if(tile != null && tile.build != null && tile.build.team != unit.team()){
-                    blockedByBlock = true;
-                    return true;
-                }else{
-                    return tile == null || tile.solid();
+                //raycast for target
+                boolean blocked = Vars.world.raycast(unit.tileX(), unit.tileY(), target.tileX(), target.tileY(), (x, y) -> {
+                    Tile tile = Vars.world.tile(x, y);
+                    if(tile != null && tile.build == target) return false;
+                    if(tile != null && tile.build != null && tile.build.team != unit.team()){
+                        blockedByBlock = true;
+                        return true;
+                    }else{
+                        return tile == null || tile.solid();
+                    }
+                });
+
+                //shoot when there's an enemy block in the way
+                if(blockedByBlock){
+                    shoot = true;
                 }
-            });
 
-            //shoot when there's an enemy block in the way
-            if(blockedByBlock){
-                shoot = true;
-            }
-
-            if(!blocked){
-                moveToTarget = true;
-                //move towards target directly
-                unit.moveAt(vec.set(target).sub(unit).limit(unit.type().speed));
+                if(!blocked){
+                    moveToTarget = true;
+                    //move towards target directly
+                    unit.moveAt(vec.set(target).sub(unit).limit(unit.type().speed));
+                }
             }
 
         }
@@ -78,4 +83,10 @@ public class SuicideAI extends GroundAI{
 
         unit.controlWeapons(rotate, shoot);
     }
+
+    @Override
+    protected Teamc target(float x, float y, float range, boolean air, boolean ground){
+        return Units.closestTarget(unit.team, x, y, range, u -> u.checkTarget(air, ground), t -> ground &&
+            !(t.block instanceof Conveyor || t.block instanceof Conduit)); //do not target conveyors/conduits
+    }
 }
diff --git a/core/src/mindustry/content/UnitTypes.java b/core/src/mindustry/content/UnitTypes.java
index d01be43902..17ec827055 100644
--- a/core/src/mindustry/content/UnitTypes.java
+++ b/core/src/mindustry/content/UnitTypes.java
@@ -514,7 +514,7 @@ public class UnitTypes implements ContentList{
         crawler = new UnitType("crawler"){{
             defaultController = SuicideAI::new;
 
-            speed = 0.92f;
+            speed = 1f;
             hitSize = 8f;
             health = 180;
             mechSideSway = 0.25f;
@@ -529,9 +529,9 @@ public class UnitTypes implements ContentList{
                     hitEffect = Fx.pulverize;
                     lifetime = 10f;
                     speed = 1f;
-                    splashDamageRadius = 55f;
+                    splashDamageRadius = 70f;
                     instantDisappear = true;
-                    splashDamage = 60f;
+                    splashDamage = 80f;
                     killShooter = true;
                     hittable = false;
                     collidesAir = true;
@@ -1187,8 +1187,6 @@ public class UnitTypes implements ContentList{
                     healPercent = 5.5f;
                     collidesTeam = true;
                     backColor = Pal.heal;
-                    frontColor = Color.white;
-                    backColor = Pal.heal;
                     trailColor = Pal.heal;
                 }};
             }});
@@ -1233,7 +1231,7 @@ public class UnitTypes implements ContentList{
         }};
 
         quad = new UnitType("quad"){{
-            armor = 4f;
+            armor = 6f;
             health = 6000;
             speed = 1.2f;
             rotateSpeed = 2f;
@@ -1256,7 +1254,7 @@ public class UnitTypes implements ContentList{
             new Weapon(){{
                 x = y = 0f;
                 mirror = false;
-                reload = 60f;
+                reload = 55f;
                 minShootVelocity = 0.01f;
 
                 bullet = new BasicBulletType(){{
@@ -1289,9 +1287,9 @@ public class UnitTypes implements ContentList{
                     speed = 0.001f;
                     collides = false;
 
-                    healPercent = 10f;
-                    splashDamage = 240f;
-                    splashDamageRadius = 115f;
+                    healPercent = 15f;
+                    splashDamage = 320f;
+                    splashDamageRadius = 120f;
                 }};
             }});
         }};
diff --git a/core/src/mindustry/mod/ContentParser.java b/core/src/mindustry/mod/ContentParser.java
index 38f4db6a82..b9c119ee32 100644
--- a/core/src/mindustry/mod/ContentParser.java
+++ b/core/src/mindustry/mod/ContentParser.java
@@ -603,7 +603,7 @@ public class ContentParser{
                 customRequirements = null;
             }else{
                 researchName = research.getString("parent");
-                customRequirements = research.hasChild("requirements") ? parser.readValue(ItemStack[].class, research.getChild("requirements")) : null;
+                customRequirements = research.has("requirements") ? parser.readValue(ItemStack[].class, research.get("requirements")) : null;
             }
 
             //remove old node
diff --git a/core/src/mindustry/world/blocks/defense/Wall.java b/core/src/mindustry/world/blocks/defense/Wall.java
index 873cbaea78..abb941b899 100644
--- a/core/src/mindustry/world/blocks/defense/Wall.java
+++ b/core/src/mindustry/world/blocks/defense/Wall.java
@@ -34,7 +34,7 @@ public class Wall extends Block{
         solid = true;
         destructible = true;
         group = BlockGroup.walls;
-        buildCostMultiplier = 5f;
+        buildCostMultiplier = 6f;
         canOverdrive = false;
     }