diff --git a/build.gradle b/build.gradle
index ce7c8060b2..2a44616829 100644
--- a/build.gradle
+++ b/build.gradle
@@ -36,7 +36,7 @@ allprojects{
         if(!project.hasProperty("versionType")) versionType = 'official'
         appName = 'Mindustry'
         steamworksVersion = '891ed912791e01fe9ee6237a6497e5212b85c256'
-        rhinoVersion = 'bf4150f7add42d26c98e33c24acfd94fa87be2e1'
+        rhinoVersion = '8437435dab9993769d72739608580d40c5343285'
 
         loadVersionProps = {
             return new Properties().with{p -> p.load(file('../core/assets/version.properties').newReader()); return p }
diff --git a/core/assets-raw/sprites/units/dagger-leg.png b/core/assets-raw/sprites/units/dagger-leg.png
index f67d4257cf..d27c010dbc 100644
Binary files a/core/assets-raw/sprites/units/dagger-leg.png and b/core/assets-raw/sprites/units/dagger-leg.png differ
diff --git a/core/assets-raw/sprites/units/mace-leg.png b/core/assets-raw/sprites/units/mace-leg.png
index 82aba38b82..bb1b501dfa 100644
Binary files a/core/assets-raw/sprites/units/mace-leg.png and b/core/assets-raw/sprites/units/mace-leg.png differ
diff --git a/core/assets-raw/sprites/units/reign-leg.png b/core/assets-raw/sprites/units/reign-leg.png
index f4c8c27e6a..1bf212125e 100644
Binary files a/core/assets-raw/sprites/units/reign-leg.png and b/core/assets-raw/sprites/units/reign-leg.png differ
diff --git a/core/assets-raw/sprites/units/scepter-leg.png b/core/assets-raw/sprites/units/scepter-leg.png
index a7df74e158..80e25079bf 100644
Binary files a/core/assets-raw/sprites/units/scepter-leg.png and b/core/assets-raw/sprites/units/scepter-leg.png differ
diff --git a/core/assets/sprites/fallback/sprites.png b/core/assets/sprites/fallback/sprites.png
index f899d82f7f..1058af3b38 100644
Binary files a/core/assets/sprites/fallback/sprites.png and b/core/assets/sprites/fallback/sprites.png differ
diff --git a/core/assets/sprites/fallback/sprites2.png b/core/assets/sprites/fallback/sprites2.png
index eb90163f97..81f5eb28fe 100644
Binary files a/core/assets/sprites/fallback/sprites2.png and b/core/assets/sprites/fallback/sprites2.png differ
diff --git a/core/assets/sprites/fallback/sprites3.png b/core/assets/sprites/fallback/sprites3.png
index 9636f9e2a8..a56f211cd9 100644
Binary files a/core/assets/sprites/fallback/sprites3.png and b/core/assets/sprites/fallback/sprites3.png differ
diff --git a/core/assets/sprites/fallback/sprites4.png b/core/assets/sprites/fallback/sprites4.png
index 06aff32753..400e224dbb 100644
Binary files a/core/assets/sprites/fallback/sprites4.png and b/core/assets/sprites/fallback/sprites4.png differ
diff --git a/core/assets/sprites/fallback/sprites7.png b/core/assets/sprites/fallback/sprites7.png
index b618d04a0c..1e4769f803 100644
Binary files a/core/assets/sprites/fallback/sprites7.png and b/core/assets/sprites/fallback/sprites7.png differ
diff --git a/core/assets/sprites/sprites.png b/core/assets/sprites/sprites.png
index cb283ac218..57a55856db 100644
Binary files a/core/assets/sprites/sprites.png and b/core/assets/sprites/sprites.png differ
diff --git a/core/assets/sprites/sprites2.png b/core/assets/sprites/sprites2.png
index 5ead94a44d..12d08701a3 100644
Binary files a/core/assets/sprites/sprites2.png and b/core/assets/sprites/sprites2.png differ
diff --git a/core/assets/sprites/sprites5.png b/core/assets/sprites/sprites5.png
index e98962419a..284ab35a22 100644
Binary files a/core/assets/sprites/sprites5.png and b/core/assets/sprites/sprites5.png differ
diff --git a/core/src/mindustry/content/Bullets.java b/core/src/mindustry/content/Bullets.java
index 7408f35da7..a89b853c28 100644
--- a/core/src/mindustry/content/Bullets.java
+++ b/core/src/mindustry/content/Bullets.java
@@ -433,6 +433,7 @@ public class Bullets implements ContentList{
             hitSize = 7f;
             lifetime = 18f;
             pierce = true;
+            collidesAir = false;
             statusDuration = 60f * 4;
             shootEffect = Fx.shootSmallFlame;
             hitEffect = Fx.hitFlameSmall;
@@ -447,6 +448,7 @@ public class Bullets implements ContentList{
             hitSize = 7f;
             lifetime = 18f;
             pierce = true;
+            collidesAir = false;
             statusDuration = 60f * 6;
             shootEffect = Fx.shootPyraFlame;
             hitEffect = Fx.hitFlameSmall;
diff --git a/core/src/mindustry/content/UnitTypes.java b/core/src/mindustry/content/UnitTypes.java
index 51b6631034..8288f7d805 100644
--- a/core/src/mindustry/content/UnitTypes.java
+++ b/core/src/mindustry/content/UnitTypes.java
@@ -103,6 +103,7 @@ public class UnitTypes implements ContentList{
             targetAir = false;
             health = 790;
             armor = 9f;
+            mechFrontSway = 0.55f;
 
             weapons.add(new Weapon("artillery"){{
                 y = 1f;
@@ -131,11 +132,13 @@ public class UnitTypes implements ContentList{
             speed = 0.35f;
             hitsize = 20f;
             rotateSpeed = 2.1f;
-            targetAir = false;
             health = 9000;
             armor = 11f;
-            mechLegMoveScl = 1.3f;
             canDrown = false;
+            mechFrontSway = 1f;
+
+            mechStepParticles = true;
+            mechStepShake = 0.15f;
 
             weapons.add(
             new Weapon("scepter-weapon"){{
@@ -188,11 +191,13 @@ public class UnitTypes implements ContentList{
             speed = 0.35f;
             hitsize = 26f;
             rotateSpeed = 1.65f;
-            targetAir = false;
             health = 24000;
             armor = 14f;
-            mechLegMoveScl = 1.75f;
+            mechStepParticles = true;
+            mechStepShake = 0.75f;
             canDrown = false;
+            mechFrontSway = 1.9f;
+            mechSideSway = 0.6f;
 
             weapons.add(
             new Weapon("reign-weapon"){{
@@ -201,7 +206,7 @@ public class UnitTypes implements ContentList{
                 shootY = 11f;
                 reload = 9f;
                 recoil = 5f;
-                shake = 4f;
+                shake = 2f;
                 ejectEffect = Fx.shellEjectBig;
                 shootSound = Sounds.artillery;
 
@@ -319,6 +324,7 @@ public class UnitTypes implements ContentList{
             landShake = 2f;
 
             commandLimit = 24;
+            mechFrontSway = 0.55f;
 
             speed = 0.4f;
             hitsize = 10f;
@@ -357,7 +363,7 @@ public class UnitTypes implements ContentList{
             speed = 0.85f;
             hitsize = 8f;
             health = 170;
-            sway = 0.25f;
+            mechSideSway = 0.25f;
             range = 40f;
 
             weapons.add(new Weapon(){{
diff --git a/core/src/mindustry/entities/EntityCollisions.java b/core/src/mindustry/entities/EntityCollisions.java
index 2d8402e92c..b4e2355380 100644
--- a/core/src/mindustry/entities/EntityCollisions.java
+++ b/core/src/mindustry/entities/EntityCollisions.java
@@ -10,7 +10,7 @@ import static mindustry.Vars.*;
 
 public class EntityCollisions{
     //range for tile collision scanning
-    private static final int r = 1;
+    private static final int r = 2;
     //move in 1-unit chunks
     private static final float seg = 1f;
 
diff --git a/core/src/mindustry/entities/EntityGroup.java b/core/src/mindustry/entities/EntityGroup.java
index 5a1be4bdc3..1157b83ff9 100644
--- a/core/src/mindustry/entities/EntityGroup.java
+++ b/core/src/mindustry/entities/EntityGroup.java
@@ -57,7 +57,7 @@ public class EntityGroup<T extends Entityc> implements Iterable<T>{
         each(Entityc::update);
     }
 
-    public void copy(Seq arr){
+    public void copy(Seq<T> arr){
         arr.addAll(array);
     }
 
diff --git a/core/src/mindustry/entities/comp/MechComp.java b/core/src/mindustry/entities/comp/MechComp.java
index d258e75406..407b256136 100644
--- a/core/src/mindustry/entities/comp/MechComp.java
+++ b/core/src/mindustry/entities/comp/MechComp.java
@@ -8,7 +8,7 @@ import mindustry.gen.*;
 @Component
 abstract class MechComp implements Posc, Flyingc, Hitboxc, Unitc, Mechc, ElevationMovec{
     @SyncField(false) @SyncLocal float baseRotation;
-    transient float walkTime;
+    transient float walkTime, walkExtension;
 
     @Override
     public void update(){
diff --git a/core/src/mindustry/type/UnitType.java b/core/src/mindustry/type/UnitType.java
index 973fd13c6f..458d23ac6c 100644
--- a/core/src/mindustry/type/UnitType.java
+++ b/core/src/mindustry/type/UnitType.java
@@ -48,7 +48,6 @@ public class UnitType extends UnlockableContent{
     public boolean canBoost = false;
     public boolean destructibleWreck = true;
     public float groundLayer = Layer.groundUnit;
-    public float sway = 1f;
     public float payloadCapacity = 8;
     public int commandLimit = 24;
     public float visualElevation = -1f;
@@ -62,7 +61,12 @@ public class UnitType extends UnlockableContent{
     public float legLength = 10f, legSpeed = 0.1f, legTrns = 1f, legBaseOffset = 0f, legMoveSpace = 1f, legExtension = 0, legPairOffset = 0, legLengthScl = 1f, kinematicScl = 1f, maxStretch = 1.75f;
     public float legSplashDamage = 0f, legSplashRange = 5;
     public boolean flipBackLegs = true;
-    public float mechLegMoveScl = 1f;
+
+    public float mechSideSway = 0.54f, mechFrontSway = 0.1f;
+    public float mechStride = -1f;
+    public float mechStepShake = -1f;
+    public boolean mechStepParticles = false;
+    public Color mechLegColor = Pal.darkMetal;
 
     public int itemCapacity = -1;
     public int ammoCapacity = 220;
@@ -133,6 +137,42 @@ public class UnitType extends UnlockableContent{
                 a.update(unit);
             }
         }
+
+        if(unit instanceof Mechc){
+            updateMechEffects(unit);
+        }
+    }
+
+    public void updateMechEffects(Unit unit){
+        Mechc mech = (Mechc)unit;
+
+        float extend = walkExtend((Mechc)unit, false);
+        float base = walkExtend((Mechc)unit, true);
+        float extendScl = base % 1f;
+
+        float lastExtend = mech.walkExtension();
+
+        if(extendScl < lastExtend && base % 2f > 1f){
+            int side = -Mathf.sign(extend);
+            float width = hitsize / 2f * side, length = mechStride * 1.35f;
+
+            float cx = unit.x + Angles.trnsx(mech.baseRotation(), length, width),
+            cy = unit.y + Angles.trnsy(mech.baseRotation(), length, width);
+
+            if(mechStepShake > 0){
+                Effect.shake(mechStepShake, mechStepShake, cx, cy);
+            }
+
+            if(mechStepParticles){
+                Tile tile = world.tileWorld(cx, cy);
+                if(tile != null){
+                    Color color = tile.floor().mapColor;
+                    Fx.unitLand.at(cx, cy, hitsize/8f, color);
+                }
+            }
+        }
+
+        mech.walkExtension(extendScl);
     }
 
     public void landed(Unit unit){}
@@ -208,6 +248,15 @@ public class UnitType extends UnlockableContent{
             }
         }
 
+        if(mechStride < 0){
+            mechStride = 4f + (hitsize-8f)/2.1f;
+        }
+
+        if(mechStepShake < 0){
+            mechStepShake = Mathf.round((hitsize - 11f) / 9f);
+            mechStepParticles = hitsize > 15f;
+        }
+
         canHeal = weapons.contains(w -> w.bullet instanceof HealBulletType);
 
         //add mirrored weapon variants
@@ -286,10 +335,14 @@ public class UnitType extends UnlockableContent{
         Draw.z(z - 0.02f);
 
         if(mech != null){
-            drawMech((Unit & Mechc)mech);
+            drawMech(mech);
+
+            //side
+            legOffset.trns(mech.baseRotation(), 0f, Mathf.lerp(Mathf.sin(walkExtend(mech, true), 2f/Mathf.PI, 1) * mechSideSway, 0f, unit.elevation));
+
+            //front
+            legOffset.add(Tmp.v1.trns(mech.baseRotation() + 90, 0f, Mathf.lerp(Mathf.sin(walkExtend(mech, true), 1f/Mathf.PI, 1) * mechFrontSway, 0f, unit.elevation)));
 
-            float ft = Mathf.sin(mech.walkTime(), 3f * mechLegMoveScl, 3f);
-            legOffset.trns(mech.baseRotation(), 0f, Mathf.lerp(ft * 0.18f * sway, 0f, unit.elevation));
             unit.trns(legOffset.x, legOffset.y);
         }
 
@@ -551,14 +604,15 @@ public class UnitType extends UnlockableContent{
         Draw.reset();
     }
 
-    public <T extends Unit & Mechc> void drawMech(T unit){
+    public void drawMech(Mechc mech){
+        Unit unit = (Unit)mech;
+
         Draw.reset();
 
-        Draw.mixcol(Color.white, unit.hitTime);
-
         float e = unit.elevation;
-        float sin = Mathf.lerp(Mathf.sin(unit.walkTime(), 3f * mechLegMoveScl, 1f), 0f, e);
-        float ft = sin*(2.5f + (unit.hitSize-8f)/2f);
+
+        float sin = Mathf.lerp(Mathf.sin(walkExtend(mech, true), 2f / Mathf.PI, 1f), 0f, e);
+        float extension = walkExtend(mech, false);
         float boostTrns = e * 2f;
 
         Floor floor = unit.isFlying() ? Blocks.air.asFloor() : unit.floorOn();
@@ -568,25 +622,43 @@ public class UnitType extends UnlockableContent{
         }
 
         for(int i : Mathf.signs){
+            Draw.mixcol(Tmp.c1.set(mechLegColor).lerp(Color.white, Mathf.clamp(unit.hitTime)), Math.max(Math.max(0, i * extension / mechStride), unit.hitTime));
+
             Draw.rect(legRegion,
-            unit.x + Angles.trnsx(unit.baseRotation(), ft * i - boostTrns, -boostTrns*i),
-            unit.y + Angles.trnsy(unit.baseRotation(), ft * i - boostTrns, -boostTrns*i),
+            unit.x + Angles.trnsx(mech.baseRotation(), extension * i - boostTrns, -boostTrns*i),
+            unit.y + Angles.trnsy(mech.baseRotation(), extension * i - boostTrns, -boostTrns*i),
             legRegion.getWidth() * i * Draw.scl,
             legRegion.getHeight() * Draw.scl - Math.max(-sin * i, 0) * legRegion.getHeight() * 0.5f * Draw.scl,
-            unit.baseRotation() - 90 + 35f*i*e);
+            mech.baseRotation() - 90 + 35f*i*e);
         }
 
+        Draw.mixcol(Color.white, unit.hitTime);
+
         if(floor.isLiquid){
             Draw.color(Color.white, floor.mapColor, unit.drownTime() * 0.4f);
         }else{
             Draw.color(Color.white);
         }
 
-        Draw.rect(baseRegion, unit, unit.baseRotation() - 90);
+        Draw.rect(baseRegion, unit, mech.baseRotation() - 90);
 
         Draw.mixcol();
     }
 
+    public float walkExtend(Mechc mech, boolean scaled){
+
+        //now ranges from -maxExtension to maxExtension*3
+        float raw = mech.walkTime() % (mechStride * 4);
+
+        if(scaled) return raw / mechStride;
+
+        if(raw > mechStride*3) raw = raw - mechStride * 4;
+        else if(raw > mechStride*2) raw = mechStride * 2 - raw;
+        else if(raw > mechStride) raw = mechStride * 2 - raw;
+
+        return raw;
+    }
+
     public void applyColor(Unit unit){
         Draw.color();
         Draw.mixcol(Color.white, unit.hitTime);
diff --git a/core/src/mindustry/ui/CoreItemsDisplay.java b/core/src/mindustry/ui/CoreItemsDisplay.java
index 140723bb0b..7322f15e70 100644
--- a/core/src/mindustry/ui/CoreItemsDisplay.java
+++ b/core/src/mindustry/ui/CoreItemsDisplay.java
@@ -39,6 +39,7 @@ public class CoreItemsDisplay extends Table{
         for(Item item : content.items()){
             if(usedItems.contains(item)){
                 image(item.icon(Cicon.small)).padRight(3);
+                //TODO leaks garbage
                 label(() -> core == null ? "0" : UI.formatAmount(core.items.get(item))).padRight(3).left();
 
                 if(++i % 4 == 0){