diff --git a/annotations/src/main/java/mindustry/annotations/Annotations.java b/annotations/src/main/java/mindustry/annotations/Annotations.java
index 501c255d2e..88bd457e05 100644
--- a/annotations/src/main/java/mindustry/annotations/Annotations.java
+++ b/annotations/src/main/java/mindustry/annotations/Annotations.java
@@ -98,6 +98,8 @@ public class Annotations{
         boolean serialize() default true;
         /** Whether to generate IO code. This is for advanced usage only. */
         boolean genio() default true;
+        /** Whether I made a massive mistake by merging two different class branches */
+        boolean legacy() default false;
     }
 
     /** Indicates an internal interface for entity components. */
diff --git a/annotations/src/main/java/mindustry/annotations/entity/EntityProcess.java b/annotations/src/main/java/mindustry/annotations/entity/EntityProcess.java
index 1cd5f7c4e5..8eba0ec683 100644
--- a/annotations/src/main/java/mindustry/annotations/entity/EntityProcess.java
+++ b/annotations/src/main/java/mindustry/annotations/entity/EntityProcess.java
@@ -240,7 +240,6 @@ public class EntityProcess extends BaseProcessor{
             //look at each definition
             for(Selement<?> type : allDefs){
                 EntityDef ann = type.annotation(EntityDef.class);
-                boolean isFinal = ann.isFinal();
 
                 //all component classes (not interfaces)
                 Seq<Stype> components = allComponents(type);
@@ -274,6 +273,10 @@ public class EntityProcess extends BaseProcessor{
                     name += "Entity";
                 }
 
+                if(ann.legacy()){
+                    name += "Legacy" + Strings.capitalize(type.name());
+                }
+
                 //skip double classes
                 if(usedNames.containsKey(name)){
                     extraNames.get(usedNames.get(name), ObjectSet::new).add(type.name());
diff --git a/annotations/src/main/resources/revisions/quad/3.json b/annotations/src/main/resources/revisions/quad/3.json
new file mode 100644
index 0000000000..d091179927
--- /dev/null
+++ b/annotations/src/main/resources/revisions/quad/3.json
@@ -0,0 +1 @@
+{version:3,fields:[{name:ammo,type:float},{name:armor,type:float},{name:controller,type:mindustry.entities.units.UnitController},{name:elevation,type:float},{name:flag,type:double},{name:health,type:float},{name:isShooting,type:boolean},{name:mineTile,type:mindustry.world.Tile},{name:mounts,type:"mindustry.entities.units.WeaponMount[]"},{name:payloads,type:arc.struct.Seq<mindustry.world.blocks.payloads.Payload>},{name:plans,type:arc.struct.Queue<mindustry.entities.units.BuildPlan>},{name:rotation,type:float},{name:shield,type:float},{name:spawnedByCore,type:boolean},{name:stack,type:mindustry.type.ItemStack},{name:statuses,type:arc.struct.Seq<mindustry.entities.units.StatusEntry>},{name:team,type:mindustry.game.Team},{name:type,type:mindustry.type.UnitType},{name:x,type:float},{name:y,type:float}]}
\ No newline at end of file
diff --git a/core/src/mindustry/ai/types/FormationAI.java b/core/src/mindustry/ai/types/FormationAI.java
index 002c52a75c..98f4874779 100644
--- a/core/src/mindustry/ai/types/FormationAI.java
+++ b/core/src/mindustry/ai/types/FormationAI.java
@@ -2,17 +2,13 @@ package mindustry.ai.types;
 
 import arc.math.*;
 import arc.math.geom.*;
-import arc.struct.*;
 import arc.util.*;
 import mindustry.ai.formations.*;
 import mindustry.entities.units.*;
 import mindustry.gen.*;
-import mindustry.type.*;
-import mindustry.world.*;
 import mindustry.world.blocks.storage.CoreBlock.*;
 
 public class FormationAI extends AIController implements FormationMember{
-    private static Seq<Tile> tiles = new Seq<>();
     public Unit leader;
 
     private Vec3 target = new Vec3();
@@ -30,9 +26,8 @@ public class FormationAI extends AIController implements FormationMember{
 
     @Override
     public void updateUnit(){
-        UnitType type = unit.type;
 
-        if(leader.dead){
+        if(leader == null || leader.dead){
             unit.resetController();
             return;
         }
diff --git a/core/src/mindustry/content/UnitTypes.java b/core/src/mindustry/content/UnitTypes.java
index c5dcea0d42..53757ee04b 100644
--- a/core/src/mindustry/content/UnitTypes.java
+++ b/core/src/mindustry/content/UnitTypes.java
@@ -33,7 +33,10 @@ public class UnitTypes implements ContentList{
     public static @EntityDef({Unitc.class, Legsc.class, Builderc.class}) UnitType spiroct, arkyid, toxopid;
 
     //air (no special traits)
-    public static @EntityDef({Unitc.class}) UnitType flare, eclipse, horizon, zenith, antumbra, mono;
+    public static @EntityDef({Unitc.class}) UnitType flare, eclipse, horizon, zenith, antumbra;
+
+    //air, legacy mining
+    public static @EntityDef(value = {Unitc.class}, legacy = true) UnitType mono;
 
     //air + building + mining
     public static @EntityDef({Unitc.class, Builderc.class}) UnitType poly;
@@ -42,13 +45,13 @@ public class UnitTypes implements ContentList{
     public static @EntityDef({Unitc.class, Builderc.class, Payloadc.class}) UnitType mega;
 
     //air + building + payload
-    public static @EntityDef({Unitc.class, Builderc.class, Payloadc.class}) UnitType quad;
+    public static @EntityDef(value = {Unitc.class, Builderc.class, Payloadc.class}, legacy = true) UnitType quad;
 
     //air + building + payload
     public static @EntityDef({Unitc.class, Builderc.class, Payloadc.class, AmmoDistributec.class}) UnitType oct;
 
     //air + building + mining
-    public static @EntityDef({Unitc.class, Builderc.class,}) UnitType alpha, beta, gamma;
+    public static @EntityDef({Unitc.class, Builderc.class}) UnitType alpha, beta, gamma;
 
     //water
     public static @EntityDef({Unitc.class, WaterMovec.class}) UnitType risso, minke, bryde, sei, omura;