Grayven is a DC Comics supervillain, and one of the three sons of Darkseid, current ruler of the planet Apokolips. He was created by Ron Marz and Darryl Banks in Green Lantern v3 #74, June (1996).
Grayven led a campaign of destruction against the cosmos, decimating planets. In the process, he effectively eliminated the Darkstars, a galactic police force. His campaign came to an end on the planet Rann. He desired a zeta beam device, a product of Rannian science that provides instantenous transportation on a grand scale. He intended 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 faced off against the man himself. Rayner fought valiantly, using emerald constructs against Grayven's super strength and optic blasts. Grayven continued to hold the upper hand, even when Darkstar John Stewart joined the fight. Grayven unleashed a fierce optic blast upon Stewart, seemingly taking him out of the fight. While Rayner and Grayven continued their struggle, Stewart sought out a zeta beam device, and attempted to teleport Grayven to a random location. Rayner pushed Grayven into the zeta beam's path, ending the fight. Lacking their leader, Grayven's forces retreated.
Unknown to Stewart, he had inadvertently teleported Grayven deep within Earth's core. He eventually dug himself out, and sought out Kyle Rayner in New York City. This time, Rayner seemed 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, as part of an alien alliance that also included Maxima, Starfire, Adam Strange, and Darkseid. They sought to eliminate Imperiex, a cosmic giant who destroys whole solar systems. In Adventures of Superman #595, (Oct 2001) 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.
Last Laugh and Ion
During his banishment to Earth, Grayven is infected with a variant of Joker toxin that causes insanity. He attempts to perform at, and then destroy, a comedy club. Kyle Rayner again stops him. Grayven later reappeared in Ion: Guardian of the Universe. 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. Rayner blasts Grayven into unconsciousness.
Death of the New Gods
Grayven has since appeared in Five of a Kind: Thunder/Martian Manhunter, lobotomized and nearly catatonic. Thunder and the Martian Manhunter restore his mind and assist him in building a zeta beam generator meant to send the unknown scourge of the New Gods (as seen in Countdown) to Darkseid's throne room. This would force Darkseid and the killer to fight, with the result benefitting Grayven either way. Thunder and J'onn trick Grayven, however; J'onn shapeshifts into the Black Racer, the New Gods' incarnation of Death, which prompts Grayven to use the zeta beam on himself to escape. Moments later at his destination he is found and murdered by the real killer (later revealed to be Infinity-Man).
Powers and Abilities
Grayven possesses formidable super-strength and endurance. Additionally, as a New God, he cannot die from natural causes. His greatest power is a limited form of the Omega Effect used by his father, Darkseid. His power levels are high enough to easily fight the Green Lantern Kyle Rayner and the Darkstars, yet not enough to take on Superman.