Use status effects for elixirs and cold demon slow.

abms.lua

@@ -184,6 +184,8 @@ minetest.register_globalstep(function(dtime)
 					else
 						fun_caves.db.status[player_name][name] = nil
 					end
+				elseif def.during then
+					def.during(player)
 				end
 			end
 

demon.lua

@@ -162,10 +162,6 @@ local snow_demon = {
 		walkmine_end    = 219,
 	},
 	animation_speed = 30,
-	on_die = function(self)
-		self.slowed:set_physics_override({speed=1})
-		self.slowed = nil
-	end,
 	do_custom = function(self)
 		if not self.attack then
 			self.fly = false
@@ -175,14 +171,7 @@ local snow_demon = {
 		snow_effect(pos, 20)
 
 		if self.attack then
-			self.attack:set_physics_override({speed=0.3})
-			self.slowed = self.attack
-		elseif self.slowed then
-			local player = self.slowed
-			minetest.after(20, function()
-				player:set_physics_override({speed=1})
-			end)
-			self.slowed = nil
+			fun_caves.set_status(self.attack:get_player_name(), 'slow_cold', 20)
 		end
 
 		if not fun_caves.custom_ready(self) then
@@ -193,6 +182,16 @@ local snow_demon = {
 	end,
 }
 
+fun_caves.register_status({
+	name = 'slow_cold',
+	start = function(player)
+		player:set_physics_override({speed=0.3})
+	end,
+	terminate = function(player)
+		player:set_physics_override({speed=1})
+	end,
+})
+
 if minetest.registered_entities["mobs_yeti:yeti"] then
 	snow_demon.arrow = "mobs_yeti:snowball"
 	snow_demon.attack_type = 'dogshoot'

elixir.lua

@@ -54,10 +54,7 @@ local function armor(user, factor)
 	armor.fleshy = math.min(100, math.max(1, math.ceil(armor.fleshy * factor)))
 	user:set_armor_groups(armor)
 	minetest.chat_send_player(player_name, 'Your skin feels harder...')
-	fun_caves.db.status[player_name].armor_elixir = {
-		remove = minetest.get_gametime() + elixir_duration,
-		factor = factor,
-	}
+	fun_caves.set_status(player_name, 'armor_elixir', elixir_duration, {factor = factor})
 end
 
 local descs = {

init.lua

@@ -112,6 +112,29 @@ function fun_caves.register_status(def)
 	}
 end
 
+function fun_caves.set_status(player_name, status, time, param)
+	local player = minetest.get_player_by_name(player_name)
+	local def = fun_caves.registered_status[status]
+	if not (def and player) then
+		return
+	end
+
+	if not param then
+		param = {}
+	end
+
+	if time then
+		param.remove = minetest.get_gametime() + time
+	end
+
+	if player_name and status and fun_caves.db.status[player_name] then
+		fun_caves.db.status[player_name][status] = param
+		if def.start then
+			def.start(player)
+		end
+	end
+end
+
 
 --dofile(fun_caves.path .. "/recipe_list.lua")