diff --git a/Spigot-Server-Patches/0448-Improved-Watchdog-Support.patch b/Spigot-Server-Patches/0448-Improved-Watchdog-Support.patch
index ece2bbb42f..28af7ad00f 100644
--- a/Spigot-Server-Patches/0448-Improved-Watchdog-Support.patch
+++ b/Spigot-Server-Patches/0448-Improved-Watchdog-Support.patch
@@ -331,7 +331,7 @@ index b1cf9fac28031b7f8051a0d1d5d7ce63b06d5f2d..3a46076a125bbfa19ca8a22dc5ab71fd
  
      @Override
 diff --git a/src/main/java/org/bukkit/craftbukkit/Main.java b/src/main/java/org/bukkit/craftbukkit/Main.java
-index 438e86595760be233e89c49224963e5e8ce335e3..43a763746f6eb72ae93c9b376e458edf6d86be36 100644
+index 438e86595760be233e89c49224963e5e8ce335e3..894552adf119037e97c7de27d783920db580f62b 100644
 --- a/src/main/java/org/bukkit/craftbukkit/Main.java
 +++ b/src/main/java/org/bukkit/craftbukkit/Main.java
 @@ -150,6 +150,37 @@ public class Main {
@@ -372,7 +372,7 @@ index 438e86595760be233e89c49224963e5e8ce335e3..43a763746f6eb72ae93c9b376e458edf
          try {
              options = parser.parse(args);
          } catch (joptsimple.OptionException ex) {
-@@ -245,8 +276,62 @@ public class Main {
+@@ -245,8 +276,63 @@ public class Main {
              } catch (Throwable t) {
                  t.printStackTrace();
              }
@@ -412,6 +412,7 @@ index 438e86595760be233e89c49224963e5e8ce335e3..43a763746f6eb72ae93c9b376e458edf
 +            tryPreloadClass("org.slf4j.helpers.BasicMarker");
 +            tryPreloadClass("org.slf4j.helpers.Util");
 +            tryPreloadClass("com.destroystokyo.paper.event.player.PlayerConnectionCloseEvent");
++            tryPreloadClass("com.destroystokyo.paper.event.entity.EntityRemoveFromWorldEvent");
 +            // Minecraft, seen during saving
 +            tryPreloadClass("net.minecraft.server.LightEngineLayerEventListener$Void");
 +            tryPreloadClass("net.minecraft.server.LightEngineLayerEventListener");
diff --git a/Spigot-Server-Patches/0524-Fix-Per-World-Difficulty-Remembering-Difficulty.patch b/Spigot-Server-Patches/0524-Fix-Per-World-Difficulty-Remembering-Difficulty.patch
new file mode 100644
index 0000000000..dd71609645
--- /dev/null
+++ b/Spigot-Server-Patches/0524-Fix-Per-World-Difficulty-Remembering-Difficulty.patch
@@ -0,0 +1,77 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Sun, 28 Jun 2020 03:59:10 -0400
+Subject: [PATCH] Fix Per World Difficulty / Remembering Difficulty
+
+Fixes per world difficulty with /difficulty command and also
+makes it so that the server keeps the last difficulty used instead
+of restoring the server.properties every single load.
+
+diff --git a/src/main/java/net/minecraft/server/CommandDifficulty.java b/src/main/java/net/minecraft/server/CommandDifficulty.java
+index bc71070c670d1a64c60b9f19711a5e8a50ace56e..9efc743e028650ccc9cda5a2c9deb1836253b91d 100644
+--- a/src/main/java/net/minecraft/server/CommandDifficulty.java
++++ b/src/main/java/net/minecraft/server/CommandDifficulty.java
+@@ -36,10 +36,11 @@ public class CommandDifficulty {
+     public static int a(CommandListenerWrapper commandlistenerwrapper, EnumDifficulty enumdifficulty) throws CommandSyntaxException {
+         MinecraftServer minecraftserver = commandlistenerwrapper.getServer();
+ 
+-        if (minecraftserver.getSaveData().getDifficulty() == enumdifficulty) {
++        WorldServer world = commandlistenerwrapper.getWorld(); // Paper
++        if (world.worldDataServer.getDifficulty() == enumdifficulty) { // Paper
+             throw CommandDifficulty.a.create(enumdifficulty.c());
+         } else {
+-            minecraftserver.a(enumdifficulty, true);
++            minecraftserver.a(world, enumdifficulty, true); // Paper
+             commandlistenerwrapper.sendMessage(new ChatMessage("commands.difficulty.success", new Object[]{enumdifficulty.b()}), true);
+             return 0;
+         }
+diff --git a/src/main/java/net/minecraft/server/DedicatedServer.java b/src/main/java/net/minecraft/server/DedicatedServer.java
+index 4c561181a977fd0244325880bb6a8cd6a54dcacc..8b2755a3b95e472e884976195d1d3551fc260e39 100644
+--- a/src/main/java/net/minecraft/server/DedicatedServer.java
++++ b/src/main/java/net/minecraft/server/DedicatedServer.java
+@@ -327,7 +327,7 @@ public class DedicatedServer extends MinecraftServer implements IMinecraftServer
+ 
+     @Override
+     public void updateWorldSettings() {
+-        this.a(this.getDedicatedServerProperties().difficulty, true);
++        //this.a(this.getDedicatedServerProperties().difficulty, true); // Paper - Don't overwrite level.dat's difficulty, keep current
+     }
+ 
+     @Override
+diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
+index b474f45b6d551e45f8894b3971baade33b6ccd0f..5c862de2f240a241153d90a01042664b4f05cb91 100644
+--- a/src/main/java/net/minecraft/server/MinecraftServer.java
++++ b/src/main/java/net/minecraft/server/MinecraftServer.java
+@@ -1519,11 +1519,14 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
+         this.H = keypair;
+     }
+ 
+-    public void a(EnumDifficulty enumdifficulty, boolean flag) {
+-        if (flag || !this.saveData.isDifficultyLocked()) {
+-            this.saveData.setDifficulty(this.saveData.isHardcore() ? EnumDifficulty.HARD : enumdifficulty);
+-            this.ba();
+-            this.getPlayerList().getPlayers().forEach(this::a);
++    // Paper start - fix per world difficulty
++    public void a(WorldServer world, EnumDifficulty enumdifficulty, boolean flag) {
++        WorldDataServer worldData = world.worldDataServer;
++        if (flag || !worldData.isDifficultyLocked()) {
++            worldData.setDifficulty(worldData.isHardcore() ? EnumDifficulty.HARD : enumdifficulty);
++            world.setSpawnFlags(worldData.getDifficulty() != EnumDifficulty.PEACEFUL && ((DedicatedServer)this).propertyManager.getProperties().spawnMonsters, this.getSpawnAnimals());
++            //world.players.forEach(this::a);
++            // Paper end
+         }
+     }
+ 
+diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
+index 3481991870c1237ed207654a41827791c8017717..5765e0f040aa6d581342063ee2781e949d42f71f 100644
+--- a/src/main/java/net/minecraft/server/PlayerConnection.java
++++ b/src/main/java/net/minecraft/server/PlayerConnection.java
+@@ -2780,7 +2780,7 @@ public class PlayerConnection implements PacketListenerPlayIn {
+     public void a(PacketPlayInDifficultyChange packetplayindifficultychange) {
+         PlayerConnectionUtils.ensureMainThread(packetplayindifficultychange, this, this.player.getWorldServer());
+         if (this.player.k(2) || this.isExemptPlayer()) {
+-            this.minecraftServer.a(packetplayindifficultychange.b(), false);
++            //this.minecraftServer.a(packetplayindifficultychange.b(), false); // Paper - don't allow clients to change this
+         }
+     }
+