VoxeLibre/mods/ITEMS/mcl_totems/init.lua

local hud_totem = {}

minetest.register_on_leaveplayer(function(player)
	hud_totem[player] = nil
end)

-- Save the player from death when holding totem of undying in hand
mcl_damage.register_modifier(function(obj, damage, reason)
	if obj:is_player() then
		local hp = obj:get_hp()
		if hp - damage <= 0 then
			local wield = obj:get_wielded_item()
			if wield:get_name() == "mobs_mc:totem" then
				local ppos = obj:get_pos()
				local pnname = minetest.get_node(ppos).name
				-- Some exceptions when _not_ to save the player
				for n=1, #mobs_mc.misc.totem_fail_nodes do
					if pnname == mobs_mc.misc.totem_fail_nodes[n] then
						return
					end
				end
				-- Reset breath as well
				if obj:get_breath() < 11 then
					obj:set_breath(10)
				end

				if not minetest.is_creative_enabled(obj:get_player_name()) then
					wield:take_item()
					obj:set_wielded_item(wield)
				end

				-- Effects
				minetest.sound_play({name = "mcl_totems_totem", gain=1}, {pos=ppos, max_hear_distance=16}, true)

				-- Big totem overlay
				if not hud_totem[obj] then
					hud_totem[obj] = obj:hud_add({
						hud_elem_type = "image",
						text = "mcl_totems_totem.png",
						position = { x=0.5, y=1 },
						scale = { x=17, y=17 },
						offset = { x=0, y=-178 },
						z_index = 100,
					})
					minetest.after(3, function()
						if obj:is_player() then
							obj:hud_remove(hud_totem[obj])
							hud_totem[obj] = nil
						end
					end)
				end

				-- Set HP to exactly 1
				return hp - 1
			end
		end
	end
end, 1000)