Nightmare (GA)

Nightmare is a new alien from Ben 10: Guardian Aliens. He is the third alien used in the series and also the least used. He is a Hauntite from the Specter Nebula.

Appearence
Nightmare is by far the scariest alien Ben has ever used. He has a black, scrawny body with two large claws and two long legs. He has four large appendages on his back resembling spider legs, and he uses these as his primary form of travel. He has black, curving horn-like objects and large, swirling eyes.

Powers and Weaknesses
Nightmare's most used power is he can fire bolts of purple fire. Upon contact with it, living creatures will experience their worst fear and undergo hallucinations so lifelike they may die. Nightmare possesses limited psychic powers, but this really only extends to mindreading. Nightmare also has shapeshifting abilities, normally used in combination with mindreading to find a foes worst fear, and then become it.

Nightmare's only weakness is that Ben can occasionally lose control of the form.