Energy vampire

An energy vampire is a robotic lifeform who has had their energy drained by the monstrous beast known as the Dweller. Upon contact with the Dweller, its victims become gray-skinned, red-eyed, and mindless. They begin shambling around, drawn towards those who have not yet been turned. Simply touching another spreads the malady. Ultimately, they all return to the Dweller, delivering their captured energy to it.

According to Perceptor, this phenomenon is a form of energy depletion, turning the affected into energy leeches. He theorizes that a massive energy infusion could return a vampirized robot to normal.

MUX History
The inhabitants of the planet Arkus were either killed or turned into energy vampires when the Quintessons dropped the Dweller on their world.