Lots of crap

src/main/java/com/volmit/iris/util/mantle/Mantle.java

@@ -20,6 +20,7 @@ package com.volmit.iris.util.mantle;
 
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.IrisSettings;
+import com.volmit.iris.core.tools.IrisToolbelt;
 import com.volmit.iris.engine.data.cache.Cache;
 import com.volmit.iris.engine.framework.Engine;
 import com.volmit.iris.engine.mantle.EngineMantle;
@@ -570,6 +571,11 @@ public class Mantle {
     }
 
     public void deleteChunkSlice(int x, int z, Class<?> c) {
+        if(!IrisToolbelt.toolbeltConfiguration.isEmpty() && IrisToolbelt.toolbeltConfiguration.getOrDefault("retain.mantle." + c.getCanonicalName(), false))
+        {
+            return;
+        }
+
         getChunk(x, z).deleteSlices(c);
     }
 

src/main/java/com/volmit/iris/util/mantle/MantleFlag.java

@@ -31,7 +31,8 @@ public enum MantleFlag {
     FLUID_BODIES,
     INITIAL_SPAWNED_MARKER,
     CLEANED,
-    PLANNED;
+    PLANNED,
+    ETCHED;
 
     static StateList getStateList() {
         return new StateList(MantleFlag.values());

src/main/java/com/volmit/iris/util/matter/slices/CavernMatter.java

@@ -29,6 +29,7 @@ import java.io.IOException;
 @Sliced
 public class CavernMatter extends RawMatter<MatterCavern> {
     public static final MatterCavern EMPTY = new MatterCavern(false, "", (byte) 0);
+    public static final MatterCavern BASIC = new MatterCavern(true, "", (byte) 0);
 
     public CavernMatter() {
         this(1, 1, 1);