A possible boss for the mountain area? His name is Cogwork, an evil wizard thing that is creating an army of automatons, but needs the brains of other creatures to create it. He would be fought at the end of the mountain, at the mouth of the cave (thus the darkness) Right now, his only attacks are flinging around the remade swarmbots (which takes one hit to kill), shooting green fireballs and shooting gears.
Thoughts? He only has 4 animations right now... The swarmbots can be defeated with your mouse! He's inspired a lot by count bleck.