Personal Info:
Real Name: Unknown
Also Known As: No known Alias
Place Of Birth: LexCorp; Metropolis
First Appearance: Action Comics Vol.1 #901 (2011) Modern Age Villain
Known Associates: Lex Luthor
Group Affiliation: None
Base Of Operations: Mobile
Grudges: Superman
Creators: Paul Cornell, Jesús Merino and Kenneth Rocafor
Body Armour: Doomslayer is almost invulnerable to damage from physical and energy attacks.
Enhanced Abilities: Doomslayer has upper level superhuman strength, durability and endurance.
Evolution: Doomslayer is constantly evolving past his opponents in order to beat them.
Healing: Doomslayer’s body has no internal organs or tissues and when damaged he heals almost immediately.
Bones: Doomslayer has bony protrusions coming from his body. The bones have cut even Superman.
Leaping: Doomslayer’s highly developed leg muscles allow him to leap miles with a single bound.
Energy Projection: Doomslayer has the ability to generate and project varying waves of energy.
Kryptonite Vision: Doomslayer has the ability to generate and project Kryptonite radiation from his eyes.
Genius Level Intellect: Due to his mutation, not only has Doomslayer attained sentience, he has also gained an impressive intellect.
The Doomsday that would become the Doomslayer began his existence as a Doomsday clone created by Lex Luthor, who sought to create an army of Doomsday clones to keep Superman and his allies distracted while he sought the remaining Black Lantern energy that had been left after the Blackest Night.
This clone had been stored inside a mysterious interdimensional biomechanical life form that had been captured by Luthor and modified to suit his purposes. Each time a Doomsday clone defeated one of Superman's allies, it would bring him/her to the ship.
However, the Superman Family managed to escape imprisonment and tried to escape, only to fight an army of Doomsday clones. Supergirl punched the clone through a tunnel inside the ship, hurling the creature through a space-time portal. In this portal, minutes became days, and the clone was infused by the creature's knowledge, attaining sentience and a different physical shape. He also developed a large hatred towards Doomsday and everyone related to it in someway. Thus, the Doomslayer was born.
Doomslayer at DC Database
Doomslayer at Comic Vine
Doomslayer at Superman Wiki