diff --git a/mods/CORE/mcl_util/init.lua b/mods/CORE/mcl_util/init.lua
index a43c3d5d0b..ac913de390 100644
--- a/mods/CORE/mcl_util/init.lua
+++ b/mods/CORE/mcl_util/init.lua
@@ -410,7 +410,7 @@ function mcl_util.get_color(colorstr)
 	local mc_color = mcl_colors[colorstr:upper()]
 	if mc_color then
 		colorstr = mc_color
-	elseif #colorstr ~= 7 or colorstr:sub(1, 1) ~= "#"then
+	elseif #colorstr ~= 7 or colorstr:sub(1, 1) ~= "#" then
 		return
 	end
 	local hex = tonumber(colorstr:sub(2, 7), 16)
diff --git a/mods/ENTITIES/mcl_mobs/api.lua b/mods/ENTITIES/mcl_mobs/api.lua
index 6e932ed5e5..e599f21277 100644
--- a/mods/ENTITIES/mcl_mobs/api.lua
+++ b/mods/ENTITIES/mcl_mobs/api.lua
@@ -3526,14 +3526,6 @@ local mob_step = function(self, dtime)
 
 	-- end rotation
 
-	-- knockback timer
-	if self.pause_timer > 0 then
-
-		self.pause_timer = self.pause_timer - dtime
-
-		return
-	end
-
 	-- run custom function (defined in mob lua file)
 	if self.do_custom then
 
@@ -3543,6 +3535,14 @@ local mob_step = function(self, dtime)
 		end
 	end
 
+	-- knockback timer
+	if self.pause_timer > 0 then
+
+		self.pause_timer = self.pause_timer - dtime
+
+		return
+	end
+
 	-- attack timer
 	self.timer = self.timer + dtime
 
diff --git a/mods/ENTITIES/mobs_mc/ender_dragon.lua b/mods/ENTITIES/mobs_mc/ender_dragon.lua
index ddaea360f8..509409a2e2 100644
--- a/mods/ENTITIES/mobs_mc/ender_dragon.lua
+++ b/mods/ENTITIES/mobs_mc/ender_dragon.lua
@@ -59,6 +59,9 @@ mobs:register_mob("mobs_mc:enderdragon", {
 		run_start = 0,		run_end = 20,
 	},
 	ignores_nametag = true,
+	do_custom = function(self)
+		mcl_bossbars.update_boss(self, "Ender Dragon", "light_purple")
+	end,
 	on_die = function(self, pos)
 		if not self._respawned then
 			mcl_experience.throw_experience(pos, 11500) -- 500 + 11500 = 12000
diff --git a/mods/ENTITIES/mobs_mc/wither.lua b/mods/ENTITIES/mobs_mc/wither.lua
index caf5a248d3..8e7f7eb95d 100644
--- a/mods/ENTITIES/mobs_mc/wither.lua
+++ b/mods/ENTITIES/mobs_mc/wither.lua
@@ -73,6 +73,7 @@ mobs:register_mob("mobs_mc:wither", {
 			self.object:set_properties({textures={self.base_texture}})
 			self.armor = {undead = 80, fleshy = 80}
 		end
+		mcl_bossbars.update_boss(self, "Wither", "dark_purple")
 	end,
 	on_spawn = function(self)
 		minetest.sound_play("mobs_mc_wither_spawn", {object=self.object, gain=1.0, max_hear_distance=64})
@@ -115,4 +116,4 @@ mobs:register_arrow("mobs_mc:wither_skull", {
 --Spawn egg
 mobs:register_egg("mobs_mc:wither", S("Wither"), "mobs_mc_spawn_icon_wither.png", 0, true)
 
-mcl_wip.register_wip_item("mobs_mc:wither")
\ No newline at end of file
+mcl_wip.register_wip_item("mobs_mc:wither")
diff --git a/mods/HUD/mcl_bossbars/init.lua b/mods/HUD/mcl_bossbars/init.lua
new file mode 100644
index 0000000000..38dbbe3762
--- /dev/null
+++ b/mods/HUD/mcl_bossbars/init.lua
@@ -0,0 +1,124 @@
+mcl_bossbars = {
+	bars = {},
+	huds = {},
+	colors = {"light_purple", "blue", "red", "green", "yellow", "dark_purple", "white"},
+}
+
+function mcl_bossbars.recalculate_colors()
+	local sorted = {}
+	local colors = mcl_bossbars.colors
+	local color_count = #colors
+	local frame_count = color_count * 2
+	for i, color in ipairs(colors) do
+		local idx = i * 2 - 1
+		local image = "mcl_bossbars.png"
+			.. "^[transformR270"
+			.. "^[verticalframe:" .. frame_count .. ":" .. (idx - 1)
+			.. "^(mcl_bossbars_empty.png"
+			.. "^[lowpart:%d:mcl_bossbars.png"
+			.. "^[transformR270"
+			.. "^[verticalframe:" .. frame_count .. ":" .. idx .. ")"
+		local _, hex = mcl_util.get_color(color)
+		sorted[color] = {
+			image = image,
+			hex = hex,
+		}
+	end
+	mcl_bossbars.colors_sorted = sorted
+end
+
+function mcl_bossbars.update_bar(player, text, color, percentage)
+	local cdef = mcl_bossbars.colors_sorted[color]
+	table.insert(mcl_bossbars.bars[player:get_player_name()], {color = cdef.hex, text = text, image = string.format(cdef.image, percentage)})
+end
+
+function mcl_bossbars.update_boss(luaentity, name, color)
+	local object = luaentity.object
+	local text = luaentity.nametag
+	if not text or text == "" then
+		text = name
+	end
+	local percentage = math.floor(luaentity.health / luaentity.hp_max * 100)
+	for _, obj in pairs(minetest.get_objects_inside_radius(object:get_pos(), 128)) do
+		if obj:is_player() then
+			mcl_bossbars.update_bar(obj, text, color, percentage)
+		end
+	end
+end
+
+minetest.register_on_joinplayer(function(player)
+	local name = player:get_player_name()
+	mcl_bossbars.huds[name] = {}
+	mcl_bossbars.bars[name] = {}
+end)
+
+minetest.register_on_leaveplayer(function(player)
+	local name = player:get_player_name()
+	mcl_bossbars.huds[name] = nil
+	mcl_bossbars.bars[name] = nil
+end)
+
+minetest.register_globalstep(function()
+	for _, player in pairs(minetest.get_connected_players()) do
+		local name = player:get_player_name()
+		local bars = mcl_bossbars.bars[name]
+		local huds = mcl_bossbars.huds[name]
+		local huds_new = {}
+		local i = 0
+
+		while #huds > 0 or #bars > 0 do
+			local bar = table.remove(bars, 1)
+			local hud = table.remove(huds, 1)
+
+			if bar and not hud then
+				hud = {
+					color = bar.color,
+					image = bar.image,
+					text = bar.text,
+					text_id = player:hud_add({
+						hud_elem_type = "text",
+						text = bar.text,
+						number = bar.color,
+						position = {x = 0.5, y = 0},
+						alignment = {x = 0, y = 1},
+						offset = {x = 0, y = i * 40},
+					}),
+					image_id = player:hud_add({
+						hud_elem_type = "image",
+						text = bar.image,
+						position = {x = 0.5, y = 0},
+						alignment = {x = 0, y = 1},
+						offset = {x = 0, y = i * 40 + 25},
+						scale = {x = 3, y = 3},
+					}),
+				}
+			elseif hud and not bar then
+				player:hud_remove(hud.text_id)
+				player:hud_remove(hud.image_id)
+				hud = nil
+			else
+				if bar.text ~= hud.text then
+					player:hud_change(hud.text_id, "text", bar.text)
+					hud.text = bar.text
+				end
+
+				if bar.color ~= hud.color then
+					player:hud_change(hud.text_id, "number", bar.color)
+					hud.color = bar.color
+				end
+
+				if bar.image ~= hud.image then
+					player:hud_change(hud.image_id, "text", bar.image)
+					hud.image = bar.image
+				end
+			end
+
+			table.insert(huds_new, hud)
+			i = i + 1
+		end
+
+		mcl_bossbars.huds[name] = huds_new
+	end
+end)
+
+mcl_bossbars.recalculate_colors()
diff --git a/mods/HUD/mcl_bossbars/mod.conf b/mods/HUD/mcl_bossbars/mod.conf
new file mode 100644
index 0000000000..64cbd4c9f7
--- /dev/null
+++ b/mods/HUD/mcl_bossbars/mod.conf
@@ -0,0 +1,4 @@
+name = mcl_bossbars
+author = Fleckenstein
+description = Show enderdragon & wither boss bars. Also allows custom bars.
+depends = mcl_util, mcl_colors
diff --git a/mods/HUD/mcl_bossbars/textures/mcl_bossbars.png b/mods/HUD/mcl_bossbars/textures/mcl_bossbars.png
new file mode 100644
index 0000000000..55bf36dc28
Binary files /dev/null and b/mods/HUD/mcl_bossbars/textures/mcl_bossbars.png differ
diff --git a/mods/HUD/mcl_bossbars/textures/mcl_bossbars_empty.png b/mods/HUD/mcl_bossbars/textures/mcl_bossbars_empty.png
new file mode 100644
index 0000000000..1e50b6afc2
Binary files /dev/null and b/mods/HUD/mcl_bossbars/textures/mcl_bossbars_empty.png differ