diff --git a/lava_flan.lua b/lava_flan.lua
index 6a38744..a69d6ec 100644
--- a/lava_flan.lua
+++ b/lava_flan.lua
@@ -35,9 +35,12 @@ mobs:register_mob("mobs_monster:lava_flan", {
 	drops = {
 		{name = "mobs:lava_orb", chance = 15, min = 1, max = 1},
 	},
-	water_damage = 5,
+	water_damage = 8,
 	lava_damage = 0,
 	light_damage = 0,
+	immune_to = {
+		{"mobs:pick_lava", -2}, -- lava pick heals 2 health
+	},
 	animation = {
 		speed_normal = 15,
 		speed_run = 15,
diff --git a/license.txt b/license.txt
index fec6f6a..cb50163 100644
--- a/license.txt
+++ b/license.txt
@@ -19,3 +19,14 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
+
+mobs.fireball.png was originally made by Sapier and edited by Benrob:
+
+-- Animals Mod by Sapier
+--
+-- You may copy, use, modify or do nearly anything except removing this
+-- copyright notice.
+-- And of course you are NOT allow to pretend you have written it.
+--
+-- (c) Sapier
+-- Contact sapier a t gmx net
diff --git a/sand_monster.lua b/sand_monster.lua
index cf09f3f..98e840f 100644
--- a/sand_monster.lua
+++ b/sand_monster.lua
@@ -79,6 +79,14 @@ mobs:register_mob("mobs_monster:sand_monster", {
 		punch_start = 74,
 		punch_end = 105,
 	},
+	immune_to = {
+		{"default:shovel_wood", 3}, -- shovels deal more damage to sand monster
+		{"default:shovel_stone", 3},
+		{"default:shovel_bronze", 4},
+		{"default:shovel_steel", 4},
+		{"default:shovel_mese", 5},
+		{"default:shovel_diamond", 7},
+	},
 --[[
 	custom_attack = function(self, p)
 		local pos = self.object:get_pos()
@@ -91,6 +99,21 @@ mobs:register_mob("mobs_monster:sand_monster", {
 		pos.y = pos.y + 0.25
 		effect(pos, 30, "mobs_sand_particles.png", 0.1, 2, 3, 5)
 	end,
+--[[
+	on_rightclick = function(self, clicker)
+
+		local tool = clicker:get_wielded_item()
+		local name = clicker:get_player_name()
+
+		if tool:get_name() == "default:sand" then
+
+			self.owner = name
+			self.type = "npc"
+
+			mobs:force_capture(self, clicker)
+		end
+	end,
+]]
 })
 
 
diff --git a/spider.lua b/spider.lua
index 43c7489..3fa00a5 100644
--- a/spider.lua
+++ b/spider.lua
@@ -1,6 +1,12 @@
 
 local S = mobs.intllib
 
+local get_velocity = function(self)
+
+	local v = self.object:get_velocity()
+
+	return (v.x * v.x + v.z * v.z) ^ 0.5
+end
 
 -- Spider by AspireMint (CC-BY-SA 3.0 license)
 
@@ -95,6 +101,57 @@ mobs:register_mob("mobs_monster:spider", {
 
 		return true -- run only once, false/nil runs every activation
 	end,
+	-- custom function to make spiders climb vertical facings
+	do_custom = function(self, dtime)
+
+		-- quarter second timer
+		self.spider_timer = (self.spider_timer or 0) + dtime
+		if self.spider_timer < 0.25 then
+			return
+		end
+		self.spider_timer = 0
+
+		-- need to be stopped to go onwards
+		if get_velocity(self) > 0.2 then
+			self.disable_falling = false
+			return
+		end
+
+		local pos = self.object:get_pos()
+		local yaw = self.object:get_yaw()
+
+		pos.y = pos.y + self.collisionbox[2] - 0.2
+
+		local dir_x = -math.sin(yaw) * (self.collisionbox[4] + 0.5)
+		local dir_z = math.cos(yaw) * (self.collisionbox[4] + 0.5)
+		local nod = minetest.get_node_or_nil({
+			x = pos.x + dir_x,
+			y = pos.y + 0.5,
+			z = pos.z + dir_z
+		})
+
+		-- get current velocity
+		local v = self.object:get_velocity()
+
+		-- can only climb solid facings
+		if not nod or not minetest.registered_nodes[nod.name]
+		or not minetest.registered_nodes[nod.name].walkable then
+			self.disable_falling = nil
+			v.y = 0
+			self.object:set_velocity(v)
+			return
+		end
+
+--print ("----", nod.name, self.disable_falling, dtime)
+
+		-- turn off falling if attached to facing
+		self.disable_falling = true
+
+		-- move up facing
+		v.y = self.jump_height
+		mobs:set_animation(self, "jump")
+		self.object:set_velocity(v)
+	end
 })
 
 
diff --git a/stone_monster.lua b/stone_monster.lua
index 3edf04e..2e03396 100644
--- a/stone_monster.lua
+++ b/stone_monster.lua
@@ -53,6 +53,14 @@ mobs:register_mob("mobs_monster:stone_monster", {
 		punch_start = 40,
 		punch_end = 63,
 	},
+	immune_to = {
+		{"default:pick_wood", 0}, -- wooden pick doesnt hurt stone monster
+		{"default:pick_stone", 4}, -- picks deal more damage to stone monster
+		{"default:pick_bronze", 5},
+		{"default:pick_steel", 5},
+		{"default:pick_mese", 6},
+		{"default:pick_diamond", 7},
+	},
 })
 
 
diff --git a/tree_monster.lua b/tree_monster.lua
index b23aa35..0466580 100644
--- a/tree_monster.lua
+++ b/tree_monster.lua
@@ -43,11 +43,17 @@ mobs:register_mob("mobs_monster:tree_monster", {
 	lava_damage = 0,
 	light_damage = 2,
 	fall_damage = 0,
---	immune_to = {
---		{"default:axe_diamond", 5},
---		{"default:sapling", -5}, -- saplings heal
---		{"all", 0},
---	},
+	immune_to = {
+		{"default:axe_wood", 0}, -- wooden axe doesnt hurt wooden monster
+		{"default:axe_stone", 4}, -- axes deal more damage to tree monster
+		{"default:axe_bronze", 5},
+		{"default:axe_steel", 5},
+		{"default:axe_mese", 7},
+		{"default:axe_diamond", 9},
+		{"default:sapling", -5}, -- default and jungle saplings heal
+		{"default:junglesapling", -5},
+--		{"all", 0}, -- only weapons on list deal damage
+	},
 	animation = {
 		speed_normal = 15,
 		speed_run = 15,