diff --git a/dirt_monster.lua b/dirt_monster.lua
index 4dafdc4..3245790 100644
--- a/dirt_monster.lua
+++ b/dirt_monster.lua
@@ -49,8 +49,16 @@ mobs:register_mob("mobs_monster:dirt_monster", {
 	},
 })
 
-mobs:register_spawn("mobs_monster:dirt_monster",
-	{"default:dirt_with_grass", "ethereal:gray_dirt"}, 7, 0, 7000, 2, 31000, false)
+mobs:spawn({
+	name = "mobs_monster:dirt_monster",
+	nodes = {"default:dirt_with_grass", "ethereal:gray_dirt"},
+	min_light = 0,
+	max_light = 7,
+	chance = 7000,
+	active_object_count = 2,
+	min_height = 0,
+	day_toggle = false,
+})
 
 mobs:register_egg("mobs_monster:dirt_monster", S("Dirt Monster"), "default_dirt.png", 1)
 
diff --git a/dungeon_master.lua b/dungeon_master.lua
index fe2ab07..846847d 100644
--- a/dungeon_master.lua
+++ b/dungeon_master.lua
@@ -58,7 +58,14 @@ mobs:register_mob("mobs_monster:dungeon_master", {
 	},
 })
 
-mobs:register_spawn("mobs_monster:dungeon_master", {"default:stone"}, 7, 0, 7000, 1, -70)
+mobs:spawn({
+	name = "mobs_monster:dungeon_master",
+	nodes = {"default:stone"},
+	max_light = 7,
+	chance = 7000,
+	active_object_count = 1,
+	max_height = -70,
+})
 
 mobs:register_egg("mobs_monster:dungeon_master", S("Dungeon Master"), "fire_basic_flame.png", 1, true)
 
diff --git a/lava_flan.lua b/lava_flan.lua
index c6ab06a..84a23eb 100644
--- a/lava_flan.lua
+++ b/lava_flan.lua
@@ -56,7 +56,13 @@ mobs:register_mob("mobs_monster:lava_flan", {
 	end,
 })
 
-mobs:register_spawn("mobs_monster:lava_flan", {"default:lava_source"}, 15, 0, 1000, 2, 0)
+mobs:spawn({
+	name = "mobs_monster:lava_flan",
+	nodes = {"default:lava_source"},
+	chance = 1000,
+	active_object_count = 2,
+	max_height = 0,
+})
 
 mobs:register_egg("mobs_monster:lava_flan", S("Lava Flan"), "default_lava.png", 1)
 
diff --git a/mese_monster.lua b/mese_monster.lua
index bf5eefd..db5e894 100644
--- a/mese_monster.lua
+++ b/mese_monster.lua
@@ -54,7 +54,14 @@ mobs:register_mob("mobs_monster:mese_monster", {
 	},
 })
 
-mobs:register_spawn("mobs_monster:mese_monster", {"default:stone"}, 7, 0, 5000, 1, -20)
+mobs:spawn({
+	name = "mobs_monster:mese_monster",
+	nodes = {"default:stone"},
+	max_light = 7,
+	chance = 5000,
+	active_object_count = 1,
+	max_height = -20,
+})
 
 mobs:register_egg("mobs_monster:mese_monster", S("Mese Monster"), "default_mese_block.png", 1)
 
diff --git a/oerkki.lua b/oerkki.lua
index beeb5dc..449d164 100644
--- a/oerkki.lua
+++ b/oerkki.lua
@@ -57,7 +57,13 @@ mobs:register_mob("mobs_monster:oerkki", {
 	},
 })
 
-mobs:register_spawn("mobs_monster:oerkki", {"default:stone"}, 7, 0, 7000, 1, -10)
+mobs:spawn({
+	name = "mobs_monster:oerkki",
+	nodes = {"default:stone"},
+	max_light = 7,
+	chance = 7000,
+	max_height = -10,
+})
 
 mobs:register_egg("mobs_monster:oerkki", S("Oerkki"), "default_obsidian.png", 1)
 
diff --git a/sand_monster.lua b/sand_monster.lua
index c46830e..8328eca 100644
--- a/sand_monster.lua
+++ b/sand_monster.lua
@@ -55,7 +55,13 @@ mobs:register_mob("mobs_monster:sand_monster", {
 ]]
 })
 
-mobs:register_spawn("mobs_monster:sand_monster", {"default:desert_sand"}, 20, 0, 7000, 2, 31000)
+mobs:spawn({
+	name = "mobs_monster:sand_monster",
+	nodes = {"default:desert_sand"},
+	chance = 7000,
+	active_object_count = 2,
+	min_height = 0,
+})
 
 mobs:register_egg("mobs_monster:sand_monster", S("Sand Monster"), "default_desert_sand.png", 1)
 
diff --git a/spider.lua b/spider.lua
index 0a0a410..21f3919 100644
--- a/spider.lua
+++ b/spider.lua
@@ -52,8 +52,16 @@ mobs:register_mob("mobs_monster:spider", {
 	},
 })
 
-mobs:register_spawn("mobs_monster:spider",
-	{"default:desert_stone", "ethereal:crystal_dirt"}, 13, 0, 7000, 1, 71)
+mobs:spawn({
+	name = "mobs_monster:spider",
+	nodes = {"default:desert_stone", "ethereal:crystal_dirt"},
+	min_light = 0,
+	max_light = 12,
+	chance = 7000,
+	active_object_count = 1,
+	min_height = -50,
+	max_height = 31000,
+})
 
 mobs:register_egg("mobs_monster:spider", S("Spider"), "mobs_cobweb.png", 1)
 
diff --git a/stone_monster.lua b/stone_monster.lua
index f4ea6f2..e7ba7c1 100644
--- a/stone_monster.lua
+++ b/stone_monster.lua
@@ -51,7 +51,13 @@ mobs:register_mob("mobs_monster:stone_monster", {
 	},
 })
 
-mobs:register_spawn("mobs_monster:stone_monster", {"default:stone", "default:desert_stone"}, 7, 0, 7000, 1, 0)
+mobs:spawn({
+	name = "mobs_monster:stone_monster",
+	nodes = {"default:stone", "default:desert_stone"},
+	max_light = 7,
+	chance = 7000,
+	max_height = 0,
+})
 
 mobs:register_egg("mobs_monster:stone_monster", S("Stone Monster"), "default_stone.png", 1)
 
diff --git a/tree_monster.lua b/tree_monster.lua
index 771c4f1..68fc3f4 100644
--- a/tree_monster.lua
+++ b/tree_monster.lua
@@ -53,8 +53,14 @@ mobs:register_mob("mobs_monster:tree_monster", {
 	},
 })
 
-mobs:register_spawn("mobs_monster:tree_monster",
-	{"default:leaves", "default:jungleleaves"}, 7, 0, 7000, 1, 31000, false)
+mobs:spawn({
+	name = "mobs_monster:tree_monster",
+	nodes = {"default:leaves", "default:jungleleaves"},
+	max_light = 7,
+	chance = 7000,
+	min_height = 0,
+	day_toggle = false,
+})
 
 mobs:register_egg("mobs_monster:tree_monster", S("Tree Monster"), "default_tree_top.png", 1)