diff --git a/.gitignore b/.gitignore
index a5c8936..477f6f7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,8 @@
+# Folders
 .vscode
-.env
\ No newline at end of file
+.env
+
+# Files
+ns_vl_caves_schist_large.png
+ns_vl_caves_gneiss_large.png
+show.py
diff --git a/init.lua b/init.lua
index 7882487..f4e77da 100644
--- a/init.lua
+++ b/init.lua
@@ -304,6 +304,16 @@ function internal.register_ore(def)
     })
 end
 
+function internal.register_monster_spawn(name, biomes, interval, chance, aoc)
+    return mcl_mobs:spawn_specific(
+        "mobs_mc:" .. name, "overworld", "ground", biomes, 0, 7,
+        interval, chance, aoc, mcl_vars.mg_overworld_min,
+        mcl_vars.mg_overworld_max, nil, function(self, pos)
+            minetest.debug("Spawned " .. name .. " at position " .. minetest.pos_to_string(pos))
+        end
+    )
+end
+
 -- Register a new deepslate-like stone type.
 -- {
 --      -- Name of the deepslate type. Required.
@@ -528,6 +538,17 @@ function internal.overwrite_register_biome()
             OLD_REGISTER_BIOME(slate_def)
             OLD_REGISTER_BIOME(schist_def)
             OLD_REGISTER_BIOME(gneiss_def)
+
+            local biome_names = { slate_def.name, schist_def.name, gneiss_def.name }
+
+            internal.register_monster_spawn("zombie", biome_names, 30, 1000, 4)
+            internal.register_monster_spawn("rover", biome_names, 30, 100, 2)
+            internal.register_monster_spawn("skeleton", biome_names, 20, 800, 2)
+            internal.register_monster_spawn("spider", biome_names, 30, 1000, 2)
+            internal.register_monster_spawn("stalker", biome_names, 20, 1000, 2)
+            internal.register_monster_spawn("villager_zombie", biome_names, 30, 50, 4)
+            internal.register_monster_spawn("zombie", biome_names, 30, 1000, 4)
+            internal.register_monster_spawn("baby_zombie", biome_names, 30, 50, 4)
         else
             return OLD_REGISTER_BIOME(def)
         end
diff --git a/mod.conf b/mod.conf
index 23498c8..b0846d0 100644
--- a/mod.conf
+++ b/mod.conf
@@ -2,5 +2,5 @@ name=ns_vl_caves
 description=Custom caves in VoxeLibre
 author=Noordstar
 title=VoxeLibre caves
-depends=mcl_core,mcl_init,mcl_raw_ores,mcl_sounds,mcl_util,ns_cavegen
+depends=mcl_core,mcl_init,mcl_mobs,mcl_raw_ores,mcl_sounds,mcl_util,ns_cavegen
 optional_depends=
\ No newline at end of file