diff --git a/.luacheckrc b/.luacheckrc
new file mode 100644
index 0000000..f84bb17
--- /dev/null
+++ b/.luacheckrc
@@ -0,0 +1,25 @@
+std = "lua51+minetest"
+unused_args = false
+allow_defined_top = true
+max_line_length = 90
+
+stds.minetest = {
+	read_globals = {
+		"DIR_DELIM",
+		"minetest",
+		"core",
+		"dump",
+		"vector",
+		"nodeupdate",
+		"VoxelManip",
+		"VoxelArea",
+		"PseudoRandom",
+		"ItemStack",
+		"default",
+		table = {
+			fields = {
+				"copy",
+			},
+		},
+	}
+}
diff --git a/api.lua b/api.lua
index 675adc8..d8bf802 100644
--- a/api.lua
+++ b/api.lua
@@ -4,11 +4,11 @@ carbone_mobs = {}
 
 function carbone_mobs:register_mob(name, def)
 
-        -- jump = true as default
-        local is_jumping = true
-        if def.jump ~= nil then is_jumping = def.jump end
+		-- jump = true as default
+		local is_jumping = true
+		if def.jump ~= nil then is_jumping = def.jump end
 
-        -- see http://dev.minetest.net/register_entity
+		-- see http://dev.minetest.net/register_entity
 	minetest.register_entity(name, {
 		hp_max = def.hp_max,
 		physical = true,
@@ -38,8 +38,8 @@ function carbone_mobs:register_mob(name, def)
 		sounds = def.sounds,
 		animation = def.animation,
 		follow = def.follow,
-		jump = is_jumping, 
-		
+		jump = is_jumping,
+
 		timer = 0,
 		env_damage_timer = 0, -- only if state = "attack"
 		attack = {player = nil, dist = nil},
@@ -48,7 +48,7 @@ function carbone_mobs:register_mob(name, def)
 		old_y = nil,
 		lifetimer = 600,
 		tamed = false,
-		
+
 		set_velocity = function(self, v)
 			local yaw = self.object:getyaw()
 			if self.drawtype == "side" then
@@ -58,12 +58,12 @@ function carbone_mobs:register_mob(name, def)
 			local z = math.cos(yaw) * v
 			self.object:setvelocity({x =x, y = self.object:getvelocity().y, z =z})
 		end,
-		
+
 		get_velocity = function(self)
 			local v = self.object:getvelocity()
 			return (v.x^ 2 + v.z^ 2) ^ (0.5)
 		end,
-		
+
 		set_animation = function(self, type)
 			if not self.animation then
 				return
@@ -122,13 +122,13 @@ function carbone_mobs:register_mob(name, def)
 			end
 		end,
 
-                -- see http://dev.minetest.net/LuaEntitySAO
-                -- Callback method called every server tick. 
+				-- see http://dev.minetest.net/LuaEntitySAO
+				-- Callback method called every server tick.
 		on_step = function(self, dtime)
 			self.lifetimer = self.lifetimer - dtime
 			if self.lifetimer <= 0 and not self.tamed then
 				local player_count = 0
-				for _,obj in ipairs(minetest.get_objects_inside_radius(self.object:getpos(), 12)) do
+				for _, obj in ipairs(minetest.get_objects_inside_radius(self.object:getpos(), 12)) do
 					if obj:is_player() then
 						player_count = player_count + 1
 					end
@@ -136,12 +136,21 @@ function carbone_mobs:register_mob(name, def)
 				if player_count == 0 and self.state ~= "attack" then
 					local pos = self.object:getpos()
 					local hp = self.object:get_hp()
-					minetest.log("action", "A mob with " .. tostring(hp) .. " HP despawned at " .. minetest.pos_to_string(pos) .. ".")
+
+					minetest.log(
+						"action",
+						"A mob with " ..
+						tostring(hp) ..
+						" HP despawned at " ..
+						minetest.pos_to_string(pos) ..
+						"."
+					)
 					self.object:remove()
+
 					return
 				end
 			end
-			
+
 			if self.object:getvelocity().y > 0.1 then
 				local yaw = self.object:getyaw()
 				if self.drawtype == "side" then
@@ -149,19 +158,25 @@ function carbone_mobs:register_mob(name, def)
 				end
 				local x = math.sin(yaw) * -2
 				local z = math.cos(yaw) * 2
-				if minetest.get_item_group(minetest.get_node(self.object:getpos()).name, "water") ~= 0 then
+				if minetest.get_item_group(
+					minetest.get_node(self.object:getpos()).name,
+					"water"
+				) ~= 0 then
 					self.object:setacceleration({x = x, y = 1.5, z = z})
 				else
 					self.object:setacceleration({x = x, y = -14.5, z = z})
 				end
 			else
-				if minetest.get_item_group(minetest.get_node(self.object:getpos()).name, "water") ~= 0 then
+				if minetest.get_item_group(
+					minetest.get_node(self.object:getpos()).name,
+					"water"
+				) ~= 0 then
 					self.object:setacceleration({x = 0, y = 1.5, z = 0})
 				else
 					self.object:setacceleration({x = 0, y = -14.5, z = 0})
 				end
 			end
-			
+
 			--[[
 			if self.disable_fall_damage and self.object:getvelocity().y == 0 then
 				if not self.old_y then
@@ -181,21 +196,21 @@ function carbone_mobs:register_mob(name, def)
 				end
 			end
 			--]]
-			
+
 			self.timer = self.timer + dtime
 			if self.state ~= "attack" then
 				if self.timer < 0.9 then return end
 				self.timer = 0
 			end
-			
+
 --			if self.sounds and self.sounds.random and math.random(1, 100) <= 1 then
 --				minetest.sound_play(self.sounds.random, {object = self.object})
 --			end
-			
+
 			local do_env_damage = function(self)
 				local pos = self.object:getpos()
 				local n = minetest.get_node(pos)
-				
+
 				if self.light_damage and self.light_damage ~= 0
 					and pos.y > 0
 					and minetest.get_node_light(pos)
@@ -210,7 +225,7 @@ function carbone_mobs:register_mob(name, def)
 						self.object:remove()
 					end
 				end
-				
+
 				if self.water_damage and self.water_damage ~= 0 and
 					minetest.get_item_group(n.name, "water") ~= 0
 				then
@@ -221,7 +236,7 @@ function carbone_mobs:register_mob(name, def)
 						self.object:remove()
 					end
 				end
-				
+
 				if self.lava_damage and self.lava_damage ~= 0 and
 					minetest.get_item_group(n.name, "lava") ~= 0
 				then
@@ -233,7 +248,7 @@ function carbone_mobs:register_mob(name, def)
 					end
 				end
 			end
-			
+
 			self.env_damage_timer = self.env_damage_timer + dtime
 			if self.state == "attack" and self.env_damage_timer > 0.9 then
 				self.env_damage_timer = 0
@@ -241,7 +256,7 @@ function carbone_mobs:register_mob(name, def)
 			elseif self.state ~= "attack" then
 				do_env_damage(self)
 			end
-			
+
 			if self.type == "monster" then
 				for _,player in pairs(minetest.get_connected_players()) do
 					local s = self.object:getpos()
@@ -253,7 +268,7 @@ function carbone_mobs:register_mob(name, def)
 					end
 				end
 			end
-			
+
 			if self.follow ~= "" and not self.following then
 				for _,player in pairs(minetest.get_connected_players()) do
 					local s = self.object:getpos()
@@ -264,7 +279,7 @@ function carbone_mobs:register_mob(name, def)
 					end
 				end
 			end
-			
+
 			if self.following and self.following:is_player() then
 				if self.following:get_wielded_item():get_name() ~= self.follow then
 					self.following = nil
@@ -307,7 +322,7 @@ function carbone_mobs:register_mob(name, def)
 					end
 				end
 			end
-			
+
 			if self.state == "stand" then
 				if math.random(1, 4) == 1 then
 					self.object:setyaw(self.object:getyaw()+((math.random(0,360)- 14.50)/180*math.pi))
@@ -354,7 +369,7 @@ function carbone_mobs:register_mob(name, def)
 				else
 					self.attack.dist = dist
 				end
-				
+
 				local vec = {x = p.x -s.x, y = p.y -s.y, z = p.z -s.z}
 				local yaw = math.atan(vec.z/vec.x)+math.pi/2
 				if self.drawtype == "side" then
@@ -409,7 +424,7 @@ function carbone_mobs:register_mob(name, def)
 				else
 					self.attack.dist = dist
 				end
-				
+
 				local vec = {x = p.x -s.x, y = p.y -s.y, z = p.z -s.z}
 				local yaw = math.atan(vec.z/vec.x)+math.pi/2
 				if self.drawtype == "side" then
@@ -420,30 +435,30 @@ function carbone_mobs:register_mob(name, def)
 				end
 				self.object:setyaw(yaw)
 				self.set_velocity(self, 0)
-				
+
 				if self.timer > self.shoot_interval and math.random(1, 100) <= 60 then
 					self.timer = 0
-					
+
 					self:set_animation("punch")
-					
+
 					if self.sounds and self.sounds.attack then
 						minetest.sound_play(self.sounds.attack, {object = self.object})
 					end
-					
-					local p = self.object:getpos()
-					p.y = p.y + (self.collisionbox[2]+self.collisionbox[5])/2
-					local obj = minetest.add_entity(p, self.arrow)
-					local amount = (vec.x^ 2+vec.y^ 2+vec.z^ 2) ^ 0.5
+
+					local position = self.object:getpos()
+					position.y = position.y + (self.collisionbox[2] + self.collisionbox[5]) / 2
+					local obj = minetest.add_entity(position, self.arrow)
+					local amount = (vec.x ^ 2 + vec.y ^ 2 + vec.z ^ 2) ^ 0.5
 					local v = obj:get_luaentity().velocity
-					vec.y = vec.y+0
-					vec.x = vec.x*v/amount
-					vec.y = vec.y*v/amount
-					vec.z = vec.z*v/amount
+					vec.y = vec.y + 0
+					vec.x = vec.x * v / amount
+					vec.y = vec.y * v / amount
+					vec.z = vec.z * v / amount
 					obj:setvelocity(vec)
 				end
 			end
 		end, -- on_step
-		
+
 		on_activate = function(self, staticdata, dtime_s)
 			self.object:set_armor_groups({fleshy = self.armor})
 			self.object:setacceleration({x = 0, y = -14.5, z = 0})
@@ -463,11 +478,18 @@ function carbone_mobs:register_mob(name, def)
 			if self.lifetimer <= 0 and not self.tamed then
 				local pos = self.object:getpos()
 				local hp = self.object:get_hp()
-				minetest.log("action", "A mob with " .. tostring(hp) .. " HP despawned at " .. minetest.pos_to_string(pos) .. " on activation.")
+				minetest.log(
+					"action",
+					"A mob with " ..
+					tostring(hp) ..
+					" HP despawned at " ..
+					minetest.pos_to_string(pos) ..
+					" on activation."
+				)
 				self.object:remove()
 			end
 		end, -- on_activate
-		
+
 		get_staticdata = function(self)
 			local tmp = {
 				lifetimer = self.lifetimer,
@@ -475,36 +497,70 @@ function carbone_mobs:register_mob(name, def)
 			}
 			return minetest.serialize(tmp)
 		end, -- get_staticdata
-		
+
 		on_punch = function(self, hitter)
-                         local hp = self.object:get_hp()
-                         if hp >= 1 then
-                            minetest.sound_play("player_damage", {object = self.object, gain = 0.25})
-                            minetest.sound_play("hit", {pos = hitter:getpos(), gain = 0.4})
-                         end
-                         local y = self.object:getvelocity().y
-                         if y <= 0 then
-                            self.object:setvelocity({x = 0, y = y + 4.5, z = 0})
-                         end
-                         if hp <= 0 then
-                            if hitter and hitter:is_player() and hitter:get_inventory() then
-                               local pos = self.object:getpos()
-                               minetest.sound_play("player_death", {object = self.object, gain = 0.4})
-                               minetest.sound_play("hit_death", {pos = hitter:getpos(), gain = 0.4})
-                               for _,drop in ipairs(self.drops) do
-                                  if math.random(1, drop.chance) == 1 then
-                                     hitter:get_inventory():add_item("main", ItemStack(drop.name .. " " .. math.random(drop.min, drop.max)))
-                                  end
-                               end
-                            end
-                         end -- if hp <= 0
-                 end, -- on_punch
-		
+			local hp = self.object:get_hp()
+
+			if hp >= 1 then
+				minetest.sound_play(
+					"player_damage",
+					{object = self.object, gain = 0.25}
+				)
+				minetest.sound_play(
+					"hit",
+					{pos = hitter:getpos(), gain = 0.4}
+				)
+			end
+
+			local y = self.object:getvelocity().y
+
+			if y <= 0 then
+				self.object:setvelocity({x = 0, y = y + 4.5, z = 0})
+			end
+
+			if hp <= 0 then
+				if
+					hitter and
+					hitter:is_player() and
+					hitter:get_inventory()
+				then
+					minetest.sound_play(
+						"player_death",
+						{object = self.object, gain = 0.4}
+					)
+					minetest.sound_play(
+						"hit_death",
+						{pos = hitter:getpos(), gain = 0.4}
+					)
+
+					for _, drop in ipairs(self.drops) do
+						if math.random(1, drop.chance) == 1 then
+							hitter:get_inventory():add_item(
+								"main",
+								ItemStack(drop.name .. " " .. math.random(drop.min, drop.max))
+							)
+						end
+					end
+				end
+			end -- if hp <= 0
+		end, -- on_punch
+
 	})
 end   --function carbone_mobs:register_mob(name, def)
 
 carbone_mobs.spawning_mobs = {}
-function carbone_mobs:register_spawn(name, description, nodes, max_light, min_light, chance, active_object_count, max_height, spawn_func)
+
+function carbone_mobs:register_spawn(
+	name,
+	description,
+	nodes,
+	max_light,
+	min_light,
+	chance,
+	active_object_count,
+	max_height,
+	spawn_func
+)
 	carbone_mobs.spawning_mobs[name] = true
 	minetest.register_abm({
 		nodenames = nodes,
@@ -523,10 +579,20 @@ function carbone_mobs:register_spawn(name, description, nodes, max_light, min_li
 			if minetest.get_node_light(pos) > max_light then return end
 			if minetest.get_node_light(pos) < min_light then return end
 			if spawn_func and not spawn_func(pos, node) then return end
-			minetest.log("action", "Spawned " .. description .. " at " .. minetest.pos_to_string(pos) .. ".")
+			minetest.log(
+				"action",
+				"Spawned " ..
+				description ..
+				" at " ..
+				minetest.pos_to_string(pos) ..
+				"."
+			)
 			minetest.add_entity(pos, name)
-			if name ~= "carbone_mobs:rat" then return end
-			minetest.add_entity(pos, "carbone_mobs:rat") -- Rats spawn in pairs.
+
+			if name == "carbone_mobs:rat" then
+				-- Rats spawn in pairs, so always spawn a second rat
+				minetest.add_entity(pos, "carbone_mobs:rat")
+			end
 		end
 	})
 end
@@ -541,19 +607,23 @@ function carbone_mobs:register_arrow(name, def)
 		velocity = def.velocity,
 		hit_player = def.hit_player,
 		hit_node = def.hit_node,
-		
+
 		on_step = function(self, dtime)
 			local pos = self.object:getpos()
-			if minetest.registered_nodes[minetest.get_node(self.object:getpos()).name].walkable then
-				self.hit_node(self, pos, node)
+			if minetest.registered_nodes[
+				minetest.get_node(self.object:getpos()).name
+			].walkable then
+				self.hit_node(self, pos)
 				self.object:remove()
+
 				return
 			end
 			pos.y = pos.y - 1
-			for _,player in pairs(minetest.get_objects_inside_radius(pos, 1)) do
+			for _, player in pairs(minetest.get_objects_inside_radius(pos, 1)) do
 				if player:is_player() then
 					self.hit_player(self, player)
 					self.object:remove()
+
 					return
 				end
 			end
diff --git a/init.lua b/init.lua
index f12f105..987ca96 100644
--- a/init.lua
+++ b/init.lua
@@ -1,9 +1,7 @@
-dofile(minetest.get_modpath("carbone_mobs").."/api.lua")
+dofile(minetest.get_modpath("carbone_mobs") .. "/api.lua")
 
--- Minetest states since 2013 to use lua 5.1 (see http://dev.minetest.net/Lua , https://www.lua.org/manual/5.1/ )
-
--- Ensure the correct active_block_range value is used (for performance and spawning):
--- see http://dev.minetest.net/minetest.register_abm
+-- Ensure the correct active_block_range value is used (for performance and spawning).
+-- See <https://dev.minetest.net/minetest.register_abm>
 minetest.setting_set("active_block_range", 1)
 
 carbone_mobs:register_mob("carbone_mobs:dirt_monster", {
@@ -21,14 +19,12 @@ carbone_mobs:register_mob("carbone_mobs:dirt_monster", {
 	on_rightclick = nil,
 	damage = 2,
 	drops = {
-		name = "default:dirt",
-		chance = 1,
-		min = 4,
-		max = 4,
---		{name = "maptools:silver_coin",
---		chance = 1,
---		min = 2,
---		max = 2,},
+		{
+			name = "default:dirt",
+			chance = 1,
+			min = 4,
+			max = 4,
+		},
 	},
 	armor = 100,
 	drawtype = "front",
@@ -59,8 +55,15 @@ minetest.register_craftitem("carbone_mobs:dirt_monster", {
 		if pointed_thing.above then
 			minetest.add_entity(pointed_thing.above, "carbone_mobs:dirt_monster")
 			if not minetest.setting_getbool("creative_mode") then itemstack:take_item() end
-			minetest.log("action", placer:get_player_name() .. " placed a dirt monster at " .. minetest.pos_to_string(pointed_thing.above) .. ".")
+			minetest.log(
+				"action",
+				placer:get_player_name() ..
+				" placed a dirt monster at " ..
+				minetest.pos_to_string(pointed_thing.above) ..
+				"."
+			)
 		end
+
 		return itemstack
 	end,
 })
@@ -79,14 +82,12 @@ carbone_mobs:register_mob("carbone_mobs:stone_monster", {
 	run_velocity = 1.7,
 	damage = 4,
 	drops = {
-		{name = "default:stone",
-		chance = 1,
-		min = 4,
-		max = 4,},
---		{name = "maptools:silver_coin",
---		chance = 1,
---		min = 3,
---		max = 3,},
+		{
+			name = "default:stone",
+			chance = 1,
+			min = 4,
+			max = 4,
+		},
 	},
 	armor = 80,
 	drawtype = "front",
@@ -116,8 +117,15 @@ minetest.register_craftitem("carbone_mobs:stone_monster", {
 		if pointed_thing.above then
 			minetest.add_entity(pointed_thing.above, "carbone_mobs:stone_monster")
 			if not minetest.setting_getbool("creative_mode") then itemstack:take_item() end
-			minetest.log("action", placer:get_player_name() .. " placed a stone monster at " .. minetest.pos_to_string(pointed_thing.above) .. ".")
+			minetest.log(
+				"action",
+				placer:get_player_name() ..
+				" placed a stone monster at " ..
+				minetest.pos_to_string(pointed_thing.above) ..
+				"."
+			)
 		end
+
 		return itemstack
 	end,
 })
@@ -136,14 +144,12 @@ carbone_mobs:register_mob("carbone_mobs:sand_monster", {
 	run_velocity = 3,
 	damage = 1,
 	drops = {
-		{name = "default:sand",
-		chance = 1,
-		min = 4,
-		max = 4,},
---		{name = "maptools:silver_coin",
---		chance = 1,
---		min = 3,
---		max = 3,},
+		{
+			name = "default:sand",
+			chance = 1,
+			min = 4,
+			max = 4,
+		},
 	},
 	armor = 100,
 	drawtype = "front",
@@ -174,8 +180,15 @@ minetest.register_craftitem("carbone_mobs:sand_monster", {
 		if pointed_thing.above then
 			minetest.add_entity(pointed_thing.above, "carbone_mobs:sand_monster")
 			if not minetest.setting_getbool("creative_mode") then itemstack:take_item() end
-			minetest.log("action", placer:get_player_name() .. " placed a sand monster at " .. minetest.pos_to_string(pointed_thing.above) .. ".")
+			minetest.log(
+				"action",
+				placer:get_player_name() ..
+				" placed a sand monster at " ..
+				minetest.pos_to_string(pointed_thing.above) ..
+				"."
+			)
 		end
+
 		return itemstack
 	end,
 })
@@ -191,14 +204,12 @@ carbone_mobs:register_mob("carbone_mobs:sheep", {
 	walk_velocity = 1,
 	armor = 100,
 	drops = {
-		{name = "carbone_mobs:meat_raw",
-		chance = 1,
-		min = 2,
-		max = 2,},
---		{name = "maptools:copper_coin",
---		chance = 1,
---		min = 5,
---		max = 5,},
+		{
+			name = "carbone_mobs:meat_raw",
+			chance = 1,
+			min = 2,
+			max = 2,
+		},
 	},
 	drawtype = "front",
 	water_damage = 1,
@@ -250,8 +261,7 @@ carbone_mobs:register_mob("carbone_mobs:sheep", {
 			self.naked = true
 			if minetest.registered_items["wool:white"] then
 				clicker:get_inventory():add_item("main", ItemStack("wool:white 2"))
---				clicker:get_inventory():add_item("main", ItemStack("maptools:copper_coin"))
-				minetest.sound_play("default_snow_footstep", {object = self.object, gain = 0.3,})
+				minetest.sound_play("default_snow_footstep", {object = self.object, gain = 0.3})
 			end
 			self.object:set_properties({
 				textures = {"mobs_sheep_shaved.png"},
@@ -271,8 +281,15 @@ minetest.register_craftitem("carbone_mobs:sheep", {
 		if pointed_thing.above then
 			minetest.add_entity(pointed_thing.above, "carbone_mobs:sheep")
 			if not minetest.setting_getbool("creative_mode") then itemstack:take_item() end
-			minetest.log("action", placer:get_player_name() .. " placed a sheep at " .. minetest.pos_to_string(pointed_thing.above) .. ".")
+			minetest.log(
+				"action",
+				placer:get_player_name() ..
+				" placed a sheep at " ..
+				minetest.pos_to_string(pointed_thing.above) ..
+				"."
+			)
 		end
+
 		return itemstack
 	end,
 })
@@ -307,10 +324,12 @@ carbone_mobs:register_mob("carbone_mobs:rat", {
 	walk_velocity = 0.8,
 	armor = 200,
 	drops = {
-		{name = "carbone_mobs:rat",
-		chance = 1,
-		min = 1,
-		max = 1,},
+		{
+			name = "carbone_mobs:rat",
+			chance = 1,
+			min = 1,
+			max = 1,
+		},
 	},
 	drawtype = "front",
 	water_damage = 1,
@@ -329,8 +348,15 @@ minetest.register_craftitem("carbone_mobs:rat", {
 		if pointed_thing.above then
 			minetest.add_entity(pointed_thing.above, "carbone_mobs:rat")
 			if not minetest.setting_getbool("creative_mode") then itemstack:take_item() end
-			minetest.log("action", placer:get_player_name() .. " placed a rat at " .. minetest.pos_to_string(pointed_thing.above) .. ".")
+			minetest.log(
+				"action",
+				placer:get_player_name() ..
+				" placed a rat at " ..
+				minetest.pos_to_string(pointed_thing.above) ..
+				"."
+			)
 		end
+
 		return itemstack
 	end,
 })
@@ -375,14 +401,12 @@ carbone_mobs:register_mob("carbone_mobs:oerkki", {
 	run_velocity = 2.25,
 	damage = 3,
 	drops = {
-		{name = "default:obsidian",
-		chance = 1,
-		min = 4,
-		max = 4,},
---		{name = "maptools:silver_coin",
---		chance = 1,
---		min = 5,
---		max = 5,},
+		{
+			name = "default:obsidian",
+			chance = 1,
+			min = 4,
+			max = 4,
+		},
 	},
 	armor = 100,
 	drawtype = "front",
@@ -413,8 +437,15 @@ minetest.register_craftitem("carbone_mobs:oerkki", {
 		if pointed_thing.above then
 			minetest.add_entity(pointed_thing.above, "carbone_mobs:oerkki")
 			if not minetest.setting_getbool("creative_mode") then itemstack:take_item() end
-			minetest.log("action", placer:get_player_name() .. " placed an oerkki at " .. minetest.pos_to_string(pointed_thing.above) .. ".")
+			minetest.log(
+				"action",
+				placer:get_player_name() ..
+				" placed an oerkki at " ..
+				minetest.pos_to_string(pointed_thing.above) ..
+				"."
+			)
 		end
+
 		return itemstack
 	end,
 })
@@ -433,18 +464,18 @@ carbone_mobs:register_mob("carbone_mobs:tree_monster", {
 	run_velocity = 1.6,
 	damage = 5,
 	drops = {
-		{name = "default:sapling",
-		chance = 1,
-		min = 4,
-		max = 4,},
-		{name = "default:junglesapling",
-		chance = 1,
-		min = 4,
-		max = 4,},
---		{name = "maptools:silver_coin",
---		chance = 1,
---		min = 6,
---		max = 6,},
+		{
+			name = "default:sapling",
+			chance = 1,
+			min = 4,
+			max = 4,
+		},
+		{
+			name = "default:junglesapling",
+			chance = 1,
+			min = 4,
+			max = 4,
+		},
 	},
 	armor = 80,
 	drawtype = "front",
@@ -476,8 +507,15 @@ minetest.register_craftitem("carbone_mobs:tree_monster", {
 		if pointed_thing.above then
 			minetest.add_entity(pointed_thing.above, "carbone_mobs:tree_monster")
 			if not minetest.setting_getbool("creative_mode") then itemstack:take_item() end
-			minetest.log("action", placer:get_player_name() .. " placed a tree monster at " .. minetest.pos_to_string(pointed_thing.above) .. ".")
+			minetest.log(
+				"action",
+				placer:get_player_name() ..
+				" placed a tree monster at " ..
+				minetest.pos_to_string(pointed_thing.above) ..
+				"."
+			)
 		end
+
 		return itemstack
 	end,
 })
@@ -497,10 +535,12 @@ carbone_mobs:register_mob("carbone_mobs:trooper", {
 	run_velocity = 3,
 	damage = 1,
 	drops = {
-		{name = "carbone_mobs:trooper",
-		chance = 1,
-		min = 1,
-		max = 1,},
+		{
+			name = "carbone_mobs:trooper",
+			chance = 1,
+			min = 1,
+			max = 1,
+		},
 	},
 	armor = 100,
 	drawtype = "front",
@@ -530,8 +570,15 @@ minetest.register_craftitem("carbone_mobs:trooper", {
 			pointed_thing.above.y = pointed_thing.above.y + 0.5
 			minetest.add_entity(pointed_thing.above, "carbone_mobs:trooper")
 			if not minetest.setting_getbool("creative_mode") then itemstack:take_item() end
-			minetest.log("action", placer:get_player_name() .. " placed a trooper at " .. minetest.pos_to_string(pointed_thing.above) .. ".")
+			minetest.log(
+				"action",
+				placer:get_player_name() ..
+				" placed a trooper at " ..
+				minetest.pos_to_string(pointed_thing.above) ..
+				"."
+			)
 		end
+
 		return itemstack
 	end,
 })
@@ -550,14 +597,12 @@ carbone_mobs:register_mob("carbone_mobs:dungeon_master", {
 	run_velocity = 2,
 	damage = 8,
 	drops = {
-		{name = "default:mese_crystal",
-		chance = 1,
-		min = 1,
-		max = 1,},
---		{name = "maptools:silver_coin",
---		chance = 1,
---		min = 8,
---		max = 8,},
+		{
+			name = "default:mese_crystal",
+			chance = 1,
+			min = 1,
+			max = 1,
+		},
 	},
 	armor = 60,
 	drawtype = "front",
@@ -592,8 +637,15 @@ minetest.register_craftitem("carbone_mobs:dungeon_master", {
 		if pointed_thing.above then
 			minetest.add_entity(pointed_thing.above, "carbone_mobs:dungeon_master")
 			if not minetest.setting_getbool("creative_mode") then itemstack:take_item() end
-			minetest.log("action", placer:get_player_name() .. " placed a dungeon master at " .. minetest.pos_to_string(pointed_thing.above) .. ".")
+			minetest.log(
+				"action",
+				placer:get_player_name() ..
+				" placed a dungeon master at " ..
+				minetest.pos_to_string(pointed_thing.above) ..
+				"."
+			)
 		end
+
 		return itemstack
 	end,
 })
@@ -615,14 +667,14 @@ carbone_mobs:register_arrow("carbone_mobs:fireball", {
 		for dx = -1, 1 do
 			for dy = -1, 1 do
 				for dz = -1, 1 do
-					local p = {x = pos.x + dx, y = pos.y + dy, z = pos.z + dz}
+					local find_pos = {x = pos.x + dx, y = pos.y + dy, z = pos.z + dz}
 					local n = minetest.get_node(pos).name
 					if n ~= "bedrock:bedrock"
 					and n ~= "default:chest_locked"
 					and n ~= "bones:bones"
 					and n ~= "default:chest"
 					and n ~= "default:furnace" then
-						minetest.dig_node(p)
+						minetest.dig_node(find_pos)
 					end
 						minetest.sound_play("mobs_fireball_explode", {
 						pos = pos,
@@ -632,7 +684,7 @@ carbone_mobs:register_arrow("carbone_mobs:fireball", {
 			end
 		end
 	end,
-	hit_node = function(self, pos, node)
+	hit_node = function(self, pos)
 		for dx = -1, 1 do
 			for dy = -2, 1 do
 				for dz = -1, 1 do
@@ -713,7 +765,12 @@ minetest.register_craftitem("carbone_mobs:rhino", {
 		if pointed_thing.above then
 			minetest.add_entity(pointed_thing.above, "carbone_mobs:rhino")
 			if not minetest.setting_getbool("creative_mode") then itemstack:take_item() end
-			minetest.log("action", placer:get_player_name() .. " placed a rhino at " .. minetest.pos_to_string(pointed_thing.above) .. ".")
+			minetest.log(
+				"action",
+				placer:get_player_name() ..
+				" placed a rhino at " ..
+				minetest.pos_to_string(pointed_thing.above) .. "."
+			)
 		end
 		return itemstack
 	end,
@@ -727,55 +784,140 @@ carbone_mobs:register_arrow("carbone_mobs:bullet", {
 	hit_player = function(self, player)
 		local s = self.object:getpos()
 		local p = player:getpos()
-		local vec = {x =s.x-p.x, y =s.y-p.y, z =s.z-p.z}
-		player:punch(self.object, 1.0,  {
-			full_punch_interval= 1.0,
+		local vec = {x = s.x - p.x, y = s.y - p.y, z = s.z - p.z}
+		player:punch(self.object, 1.0, {
+			full_punch_interval = 1.0,
 			damage_groups = {fleshy = 2},
 		}, vec)
-		local pos = self.object:getpos()
-		for dx = -1, 1 do
-			for dy = -1, 1 do
-				for dz = -1, 1 do
-					local p = {x = pos.x + dx, y = pos.y + dy, z = pos.z + dz}
-					local n = minetest.get_node(pos).name
-				end
-			end
-		end
 	end,
-	hit_node = function(self, pos, node)
-		for dx = -1, 1 do
-			for dy = -2, 1 do
-				for dz = -1, 1 do
-					local p = {x = pos.x + dx, y = pos.y + dy, z = pos.z + dz}
-					local n = minetest.get_node(pos).name
-				end
-			end
-		end
-	end
+	hit_node = function(self, pos) end
 })
 
--- carbone_mobs:register_spawn(name, description, nodes, max_light, min_light, chance, active_object_count, max_height)
+--[[
+	carbone_mobs:register_spawn(
+		name,
+		description,
+		nodes,
+		max_light,
+		min_light,
+		chance,
+		active_object_count,
+		max_height
+	)
+]]
 
-if not minetest.setting_getbool("creative_mode") then -- Disable all mob spawning in creative mode.
-	if minetest.setting_getbool("spawn_friendly_mobs") ~= false then -- “If nil or true then”
-		local rn = {"default:stone", "default:leaves", "default:jungleleaves", "default:cactus"}
-		local sn = {"default:dirt_with_grass"}
-
-		carbone_mobs:register_spawn("carbone_mobs:rat", "two rats",                    rn, 16, -1, 7500, 6, 100)
-		carbone_mobs:register_spawn("carbone_mobs:sheep", "a sheep",                   sn, 16, 8, 20000, 2, 100)
+ -- Disable all mob spawning in creative mode
+if not minetest.setting_getbool("creative_mode") then
+	if minetest.setting_getbool("spawn_friendly_mobs") ~= false then
+		carbone_mobs:register_spawn(
+			"carbone_mobs:rat",
+			"two rats",
+			{"default:stone", "default:leaves", "default:jungleleaves", "default:cactus"},
+			16,
+			-1,
+			7500,
+			6,
+			100
+		)
+		carbone_mobs:register_spawn(
+			"carbone_mobs:sheep",
+			"a sheep",
+			{"default:dirt_with_grass"},
+			16,
+			8,
+			20000,
+			2,
+			100
+		)
 	end
-	if minetest.setting_getbool("spawn_hostile_mobs") ~= false then -- “If nil or true then”
-		local mn = {"default:stone", "default:desert_stone", "default:cobble", "default:mossycobble"}
+	if minetest.setting_getbool("spawn_hostile_mobs") ~= false then
+		local monster_nodes = {
+			"default:stone",
+			"default:desert_stone",
+			"default:cobble",
+			"default:mossycobble",
+		}
 
-		carbone_mobs:register_spawn("carbone_mobs:dirt_monster", "a dirt monster",     mn, 1, -1, 25000, 6, 0)
-		carbone_mobs:register_spawn("carbone_mobs:stone_monster", "a stone monster",   mn, 1, -1, 25000, 4, 0)
-		carbone_mobs:register_spawn("carbone_mobs:sand_monster", "a sand monster",     mn, 1, -1, 25000, 4, 0)
-		carbone_mobs:register_spawn("carbone_mobs:oerkki", "an oerkki",                mn, 1, -1, 25000, 4, 0)
-		carbone_mobs:register_spawn("carbone_mobs:tree_monster", "a tree monster",     mn, 1, -1, 25000, 2, 0)
-
-		carbone_mobs:register_spawn("carbone_mobs:trooper", "a trooper",               mn, 1, -1, 50000, 2, 0)
-		carbone_mobs:register_spawn("carbone_mobs:dungeon_master", "a dungeon master", mn, 1, -1, 50000, 2, -50)
-		carbone_mobs:register_spawn("carbone_mobs:rhino", "a rhino",                   mn, 1, -1, 50000, 2, 0)
+		carbone_mobs:register_spawn(
+			"carbone_mobs:dirt_monster",
+			"a dirt monster",
+			monster_nodes,
+			1,
+			-1,
+			25000,
+			6,
+			0
+		)
+		carbone_mobs:register_spawn(
+			"carbone_mobs:stone_monster",
+			"a stone monster",
+			monster_nodes,
+			1,
+			-1,
+			25000,
+			4,
+			0
+		)
+		carbone_mobs:register_spawn(
+			"carbone_mobs:sand_monster",
+			"a sand monster",
+			monster_nodes,
+			1,
+			-1,
+			25000,
+			4,
+			0
+		)
+		carbone_mobs:register_spawn(
+			"carbone_mobs:oerkki",
+			"an oerkki",
+			monster_nodes,
+			1,
+			-1,
+			25000,
+			4,
+			0
+		)
+		carbone_mobs:register_spawn(
+			"carbone_mobs:tree_monster",
+			"a tree monster",
+			monster_nodes,
+			1,
+			-1,
+			25000,
+			2,
+			0
+		)
+		carbone_mobs:register_spawn(
+			"carbone_mobs:trooper",
+			"a trooper",
+			monster_nodes,
+			1,
+			-1,
+			50000,
+			2,
+			0
+		)
+		carbone_mobs:register_spawn(
+			"carbone_mobs:dungeon_master",
+			"a dungeon master",
+			monster_nodes,
+			1,
+			-1,
+			50000,
+			2,
+			-50
+		)
+		carbone_mobs:register_spawn(
+			"carbone_mobs:rhino",
+			"a rhino",
+			monster_nodes,
+			1,
+			-1,
+			50000,
+			2,
+			0
+		)
 	end
 end