diff --git a/build.gradle b/build.gradle
index 45076d4ed..41de17bb8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -86,8 +86,6 @@ subprojects {
         mavenCentral()
         maven { url "http://maven.sk89q.com/repo/" }
         maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
-        // temporary, for Piston
-        mavenLocal()
     }
 }
 
diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/command/BrushCommands.java b/worldedit-core/src/main/java/com/sk89q/worldedit/command/BrushCommands.java
index d187723ba..0b29fdede 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/command/BrushCommands.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/command/BrushCommands.java
@@ -257,9 +257,7 @@ public class BrushCommands {
                              @Switch(name = 'f', desc = "Also kill all friendly mobs (Applies the flags `-abgnpt`)")
                                  boolean killFriendly,
                              @Switch(name = 'r', desc = "Also destroy armor stands")
-                                 boolean killArmorStands,
-                             @Switch(name = 'l', desc = "Kill via lightning. Currently non-functioning.")
-                                 boolean killWithLightning) throws WorldEditException {
+                                 boolean killArmorStands) throws WorldEditException {
         LocalConfiguration config = worldEdit.getConfiguration();
 
         double maxRadius = config.maxBrushRadius;
@@ -284,8 +282,6 @@ public class BrushCommands {
         flags.or(CreatureButcher.Flags.TAGGED        , killWithName, "worldedit.butcher.tagged");
         flags.or(CreatureButcher.Flags.ARMOR_STAND   , killArmorStands, "worldedit.butcher.armorstands");
 
-        flags.or(CreatureButcher.Flags.WITH_LIGHTNING, killWithLightning, "worldedit.butcher.lightning");
-
         BrushTool tool = session.getBrushTool(player.getItemInHand(HandSide.MAIN_HAND).getType());
         tool.setSize(radius);
         tool.setBrush(new ButcherBrush(flags), "worldedit.brush.butcher");
diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/command/UtilityCommands.java b/worldedit-core/src/main/java/com/sk89q/worldedit/command/UtilityCommands.java
index 12988ab56..ea292a855 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/command/UtilityCommands.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/command/UtilityCommands.java
@@ -375,9 +375,7 @@ public class UtilityCommands {
                        @Switch(name = 'f', desc = "Also kill all friendly mobs (Applies the flags `-abgnpt`)")
                            boolean killFriendly,
                        @Switch(name = 'r', desc = "Also destroy armor stands")
-                           boolean killArmorStands,
-                       @Switch(name = 'l', desc = "Kill via lightning. Currently non-functioning.")
-                           boolean killWithLightning) throws WorldEditException {
+                           boolean killArmorStands) throws WorldEditException {
         LocalConfiguration config = we.getConfiguration();
         Player player = actor instanceof Player ? (Player) actor : null;
 
@@ -406,8 +404,6 @@ public class UtilityCommands {
         flags.or(CreatureButcher.Flags.TAGGED, killWithName, "worldedit.butcher.tagged");
         flags.or(CreatureButcher.Flags.ARMOR_STAND, killArmorStands, "worldedit.butcher.armorstands");
 
-        flags.or(CreatureButcher.Flags.WITH_LIGHTNING, killWithLightning, "worldedit.butcher.lightning");
-
         int killed = killMatchingEntities(radius, player, flags::createFunction);
 
         actor.print("Killed " + killed + (killed != 1 ? " mobs" : " mob") + (radius < 0 ? "" : " in a radius of " + radius) + ".");
diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/command/util/CreatureButcher.java b/worldedit-core/src/main/java/com/sk89q/worldedit/command/util/CreatureButcher.java
index 940d6a99c..e43fee9d4 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/command/util/CreatureButcher.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/command/util/CreatureButcher.java
@@ -19,7 +19,6 @@
 
 package com.sk89q.worldedit.command.util;
 
-import com.sk89q.minecraft.util.commands.CommandContext;
 import com.sk89q.worldedit.entity.metadata.EntityProperties;
 import com.sk89q.worldedit.extension.platform.Actor;
 import com.sk89q.worldedit.function.EntityFunction;
@@ -39,7 +38,6 @@ public class CreatureButcher {
         public static final int TAGGED = 1 << 5;
         public static final int FRIENDLY = PETS | NPCS | ANIMALS | GOLEMS | AMBIENT | TAGGED;
         public static final int ARMOR_STAND = 1 << 6;
-        public static final int WITH_LIGHTNING = 1 << 20;
 
         private Flags() {
         }
@@ -64,19 +62,6 @@ public class CreatureButcher {
         }
     }
 
-    public void fromCommand(CommandContext args) {
-        or(Flags.FRIENDLY      , args.hasFlag('f')); // No permission check here. Flags will instead be filtered by the subsequent calls.
-        or(Flags.PETS          , args.hasFlag('p'), "worldedit.butcher.pets");
-        or(Flags.NPCS          , args.hasFlag('n'), "worldedit.butcher.npcs");
-        or(Flags.GOLEMS        , args.hasFlag('g'), "worldedit.butcher.golems");
-        or(Flags.ANIMALS       , args.hasFlag('a'), "worldedit.butcher.animals");
-        or(Flags.AMBIENT       , args.hasFlag('b'), "worldedit.butcher.ambient");
-        or(Flags.TAGGED        , args.hasFlag('t'), "worldedit.butcher.tagged");
-        or(Flags.ARMOR_STAND   , args.hasFlag('r'), "worldedit.butcher.armorstands");
-
-        or(Flags.WITH_LIGHTNING, args.hasFlag('l'), "worldedit.butcher.lightning");
-    }
-
     public EntityFunction createFunction() {
         return entity -> {
             boolean killPets = (flags & Flags.PETS) != 0;