Darth Sion (Alternate Timeline)

Powers and Abilites
Darth Sion was great at lightsaber combat, and used the dark side of the force to hold his decomposing body together before death, making him immortal in a infinite loop of pain. The only way for him to die is if he gives up and lets his body go to rest by breaking the hold of the dark side.

Weaponry

 * Red Lightsaber