diff --git a/FightSystem_18/src/de/steamwar/fightsystem/utils/HullHiderWrapper18.java b/FightSystem_18/src/de/steamwar/fightsystem/utils/HullHiderWrapper18.java
index 97413f7..86da5d9 100644
--- a/FightSystem_18/src/de/steamwar/fightsystem/utils/HullHiderWrapper18.java
+++ b/FightSystem_18/src/de/steamwar/fightsystem/utils/HullHiderWrapper18.java
@@ -27,7 +27,10 @@ import net.minecraft.core.SectionPosition;
 import net.minecraft.network.protocol.game.PacketPlayOutBlockChange;
 import net.minecraft.network.protocol.game.PacketPlayOutMultiBlockChange;
 import net.minecraft.world.level.block.state.IBlockData;
+import org.bukkit.Material;
+import org.bukkit.block.data.BlockData;
 
+import java.util.ArrayList;
 import java.util.List;
 
 
@@ -36,20 +39,23 @@ public class HullHiderWrapper18 implements HullHiderWrapper {
     private static final Reflection.MethodInvoker getState = Reflection.getTypedMethod(Reflection.getClass("{obc}.block.data.CraftBlockData"), "getState", IBlockData.class);
     @Override
     public Object generateBlockChangePacket(List<Hull.IntVector> changes) {
-        Object[] blockdata = new Object[changes.size()];
+        List<Object> blockdata = new ArrayList<>(changes.size());
 
-        for(int i = 0; i < changes.size(); i++) {
-            Hull.IntVector change = changes.get(i);
-            blockdata[i] = getState.invoke(Config.world.getBlockData(change.getX(), change.getY(), change.getZ()));
-        }
+        changes.removeIf(change -> {
+            //BlockData data = Config.world.getBlockData(change.getX(), change.getY(), change.getZ());
+            BlockData data = Material.EMERALD_BLOCK.createBlockData();
+            boolean unchanged = data.getMaterial() == Config.ObfuscateWith;
+            if(!unchanged)
+                blockdata.add(getState.invoke(data));
+            return unchanged;
+        });
 
-        return generateBlockChangePacket(changes, blockdata);
+        return generateBlockChangePacket(changes, blockdata.toArray());
     }
 
     private Object generateBlockChangePacket(List<Hull.IntVector> changes, Object[] blockdata) {
         if(changes.size() > 1) {
             Hull.IntVector section = changes.get(0);
-            //section = new Hull.IntVector(ProtocolUtils.posToChunk(section.getX()), ProtocolUtils.posToChunk(section.getY()), ProtocolUtils.posToChunk(section.getZ()));
             section = new Hull.IntVector(section.getX() >> 4, section.getY() >> 4, section.getZ() >> 4);
             int xOffset = 16*section.getX();
             int yOffset = 16*section.getY();
diff --git a/FightSystem_Core/src/de/steamwar/fightsystem/Config.java b/FightSystem_Core/src/de/steamwar/fightsystem/Config.java
index dba60ee..d3bd706 100644
--- a/FightSystem_Core/src/de/steamwar/fightsystem/Config.java
+++ b/FightSystem_Core/src/de/steamwar/fightsystem/Config.java
@@ -122,7 +122,7 @@ public class Config {
     public static final boolean TechhiderActive;
     public static final Set<Material> HiddenBlocks;
     public static final Set<String> HiddenBlockEntities;
-    public static final String ObfuscateWith;
+    public static final Material ObfuscateWith;
 
     //event parameter
     private static final int EventKampfID;
@@ -213,7 +213,7 @@ public class Config {
         ForbiddenItems = Collections.unmodifiableSet(config.getStringList("Kits.ForbiddenItems").stream().map(Material::valueOf).collect(Collectors.toSet()));
 
         TechhiderActive = config.getBoolean("Techhider.Active", false);
-        ObfuscateWith = config.getString("Techhider.ObfuscateWith", "end_stone").toUpperCase();
+        ObfuscateWith = Material.getMaterial(config.getString("Techhider.ObfuscateWith", "end_stone").toUpperCase());
         HiddenBlocks = config.getStringList("Techhider.HiddenBlocks").stream().map(String::toUpperCase).map(Material::getMaterial).collect(Collectors.toSet());
         HiddenBlockEntities = Collections.unmodifiableSet(new HashSet<>(config.getStringList("Techhider.HiddenBlockEntities")));
 
diff --git a/FightSystem_Core/src/de/steamwar/fightsystem/record/PacketProcessor.java b/FightSystem_Core/src/de/steamwar/fightsystem/record/PacketProcessor.java
index cb1dddb..6296e37 100644
--- a/FightSystem_Core/src/de/steamwar/fightsystem/record/PacketProcessor.java
+++ b/FightSystem_Core/src/de/steamwar/fightsystem/record/PacketProcessor.java
@@ -89,7 +89,7 @@ public class PacketProcessor implements Listener {
     private final BukkitTask task;
     private final LinkedList<Runnable> syncList = new LinkedList<>();
     private final Set<Integer> hiddenBlockIds = Config.HiddenBlocks.stream().flatMap(m -> BlockIds.impl.materialToAllIds(m).stream()).collect(Collectors.toSet());
-    private final int obfuscateWith = BlockIds.impl.materialToId(Material.getMaterial(Config.ObfuscateWith.toUpperCase()));
+    private final int obfuscateWith = BlockIds.impl.materialToId(Config.ObfuscateWith);
     private final FreezeWorld freezer = new FreezeWorld();
     private final REntityServer entityServer = new REntityServer();
     private final Map<Integer, REntity> entities = new HashMap<>();