'Identity' official description

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Powers and abilities
Doomsday was created and evolved through cloning an infant and having it killed over and over again by one of the most dangerous species of the universe and in one of the harshest habitats in existence, prehistoric Krypton. As such, he returns to life and becomes resistant or immune to what killed him before. After the Radiant killed him the first time they thought Doomsday grew immune to the latter's energy-projection, and even managed to withstand Darkseid's full Omega-Effect. The amount of damage dealt to Doomsday determines the length of time it would take to fully recover. During his outwardly undamaged death at Superman's hands he only needed some months to recover, but when Imperiex reduced him to a skeleton, it would take days.

Doomsday can also develop/evolve resistance from ordinary injuries. In the Superman/Doomsday: Hunter/Prey series Superman used a sound gun to greatly discomfort him, but Doomsday's auditory canals closed up, making him impervious to Superman's weapon. Waverider once paralyzed Doomsday with chronal energy, but the second attempt backlashed. In essence, Doomsday gradually turns more invulnerable if not injured beyond his ability to recover, which is so far undefined. Doomsday has also developed weapons and abilities that counters the powers of an opponent. He managed to cancel out the pure-energy Radiant by slamming into him, and greatly extend his claws and develop a poison to strike Superman in flight and reel him in (Also in Superman/Doomsday: Hunter/Prey) or breathe flames against the fire-sensitive Martian Manhunter.[4] Doomsday is covered by bony spurs providing protection to his few vital organs (brain, eyes, nervous system) and acting as weapons on his hands, elbows and knees.

Doomsday possesses extreme physical strength that even rivals that of Superman, at one point enabling him to effortlessly stand his ground against the entire Justice League, including Superman and Orion (The Doomsday Wars). He was able to break Superman's left arm with limited effort, as well as outmatch and beat Darkseid unconscious in physical combat. (Superman/Doomsday: Hunter/Prey) He is immensely resistant to heat, cold, and conventional damage, allowing him to survive on the most inhospitable worlds, or in the vacuum of space. Doomsday possesses seemingly inexhaustible stamina, and was not noticeably slowed down from fighting Superman for an entire day. His reflexes and speed are vastly beyond what's expected for his bulky size, and has been able to match Superman in this regard. He cannot fly, but rather travels by leaping miles at a time. Superman took advantage of this in their first battle by trying to keep him airborne, as the sky was his element.

Doomsday has a highly accelerated healing factor that allows him to quickly regenerate from most damage. When his side was cut by Superman with a plasma sword it closed within moments. As a result of his engineering, Doomsday does not need to eat, drink, breathe, or sleep and his body is almost solid mass with few vulnerable organs.

Doomsday is now genetically part-Kryptonian due to his genes having been spliced with Kal-El's, however with the exception of his flame-breath he has displayed no additional abilities. In fact he was shown weaker than previously when he was singlehandedly beaten by Superman, which should not have been possible given previous accounts. This was due to intellegence that he developed, causing him to fear the death that awaited him if he lost. He soon however lost his intellegence when sent back in time, reverting him to his original state of fearlessness.

Due to his Kryptonian DNA, he is susceptible to Kryptonite. Unlike Superman, it causes him pain but cannot kill him. This was done to render him controllable.