Masker Mind is a ghost-like creature who is one of the Undead villains in Skylanders: Trap Team. He is found inRainfish Riviera, possessing a Bomb Shell before turning his attention to the Skylanders. The evil spirit was eventually driven out of the defeated enemies and attempted to flee, but was chased down and defeated.

http://skylanders.wikia.com/wiki/Masker_Mind_(villain)