Abraxas is a mutated human slave-trader and employer of the Cavaliers, the chief supplier of humans to the Martian Masters.
Abraxas wound up being killed in the cross-fire of a massive battle between himself, Killraven and his Freemen, Rattack, and the Martians' High Overlord. He was however able to mortally wound Rattack shortly before he himself was killed.
Powers & Abilities
Abraxas' arms were mutated into powerful, squid-like tentacles. He could use these as whips, they were strong enough to crush people with them, and they had suction cups that were powerful enough to tear flesh from bone.