Spawn monsters/treasure by depth.

abms.lua

@@ -61,7 +61,7 @@ local cold_stuff = {"group:surface_cold"}
 local poison_stuff = {"group:poison"}
 local gravity_off = {gravity = 0.1}
 local gravity_on = {gravity = 1}
-local fortress_group = {'group:fortress'}
+local dungeon_group = {'group:dungeon'}
 
 local firework_active = false
 local function firework()
@@ -403,20 +403,34 @@ minetest.register_abm({
 				return
 			end
 		end
-		
-		--------------------------------------
-		-- Mobs are treated exacty the same. Spawn harder ones differently?
-		--------------------------------------
-		local name = fun_caves.fortress_spawns[math.random(#fun_caves.fortress_spawns)]
+
+		local target_level = math.max(2, math.ceil(pos.y / -2000))
+
+		local desc
+		for i = 1, 100 do
+			desc = fun_caves.dungeon_spawns[math.random(#fun_caves.dungeon_spawns)]
+			if desc.level <= target_level then
+				break
+			else
+				desc = nil
+			end
+		end
+
+		if not desc then
+			return
+		end
+
+		local name = desc.name
+		local level = desc.level
 		local mob = minetest.add_entity(pos, name)
 		if not mob then
 			return
 		end
-		--print('spawning '..name)
+		--print('Spawned '..name)
 
 		if mob.hp_max and mob.object and mob.health and mob.damage then
 			local factor = 1 + (math.max(math.abs(pos.x), math.abs(pos.y), math.abs(pos.z)) / 6200)
-			mob.started_in_fortress = true
+			mob.started_in_dungeon = true
 			factor = factor * 1.5
 			mob.hp_max = math.floor(mob.hp_max * factor)
 			mob.damage = math.floor(mob.damage * factor)