Black Mercy

Black Mercy. Name given to a parasitic alien plant-like entity that functions similarly to a fungus. The non-sentient creature appears as a collection of reddish discs with a number of brown, sinewy tentacles that radiate outward from its center. The Black Mercy attaches itself to a victim's chest while wrapping its tendrils around the torso, and subsists by feeding on its prey's bio-aura. The entity keeps its victim docile by placing him/her in a trance-like state while filling the mind with visions of his/her stongest desires being fulfilled. Mongul employed a Black Mercy as an instrument of revenge against Superman by disguising it as an anonymous birthday gift, but the Man of Steel was freed from the creature's clutches by the combined efforts of Batman, Robin and Wonder Woman. In the end, Mongul himself finally fell victim to the creature's influence (SA No. 11, 1985: "For The Man Who Has Everything").