Grayven is the third son of Darkseid, born of an unknown mother, younger brother to Kalibak and Orion. Grayven leads a campaign of destruction against the cosmos, decimating planets. In the process, he effectively eliminates the Darkstars, a galactic police force. His campaign comes to an end on the planet Rann. He desires a zeta beam device, a product of Rannian science that provides instantaneous transportation on a grand scale. He intends to zeta beam his forces onto Apokolips, announce his presence to his father, and conquer the planet.
While the remaining Darkstars engaged Gravyen's army, Green Lantern Kyle Rayner faces off against the man himself. Assisted by Darkstar John Stewart, who suffers serious injuries in the fight, Kyle tricks Grayven into a Zeta Beam device, where he is teleported off Rann. Lacking their leader, Grayven's forces retreated.
The few Darkstars that remained alive after the battle end up powerless.
Unknown to Stewart, he had inadvertently teleported Grayven deep within Earth's core. He eventually digs himself out, and seeks Kyle Rayner in New York City. This time, Rayner seems to have the upper hand. Fearing defeat at the Green Lantern's hands, Grayven used an experimental teleporter, freeing himself, and in the process, sending Rayner into the 30th century.
Grayven next appeared during the Imperiex crisis. He is part of an alien alliance, which also included Maxima, Starfire, Adam Strange, and Darkseid. They sought to eliminate Imperiex, a cosmic giant who destroys whole solar systems. Later Grayven is under the influence of Brainiac-13, a major force in the Imperiex War. He confronts Superman and Darkseid on the surface of Apokolips. He is defeated by Superman, then punished by Darkseid, who feels it is his duty to do so because Grayven has 'shamed himself'. Soon, Grayven is banished to Earth.
During his banishment to Earth, Grayven is infected with Joker toxin variant, which causes insanity. He attempts to perform at, and then destroy, a comedy club. Kyle Rayner again stops him. There he is revealed to have sent Nero and Effigy after Kyle Rayner. Grayven also is implied to be part of some larger conspiracy, most likely that of the Sinestro Corps due to his hunting of escaped Qwardians and knowledge of Kyle's sick mother. Out of anger, Rayner forcefully blasts Grayven into unconsciousness.
New God Physiology: These New Gods have evolved due to their close proximity to the Source, a primeaval energy, believed to be one of the ultimate foundations of the Universal Expression of Energy, along with their superior technology, into beings of genetic stability and evolutionary perfection. The denizens of New Genesis are stronger, faster, and smarter than homo sapiens, despite their resemblance to the same.
Master Strategist: Grayven possesses a strategic gift for the art of warfareLeader: leadership capabilities enables him to command the obedience and respect of his followers.
Radion: New Gods are vulnerable to a substance called Radion. It source is unknown and its effects are toxic only in sustained amounts or after explosive exposure. The average New God can be slain by an application of Radion from a Radion blaster or bomb. More advanced beings such as Mister Miracle, protected by their mother box, armor and sheer toughness, have been known to take two hits and survive. Radion, must be hard to come by, because if it was not, Darkseid would obviously equip more of his troops with it. Perhaps it requires the mysterious Element X to create it.