Psychozen was born with a rare disease that made his body weak and frail. Ashamed of their misshapen son, Psychozen's affluent parents hid him away from the world. Although he received every creature comfort, he was denied the most important gift of all -- the affection of another human being.
No one knew that Psychozen was actually the latest incarnation of a long line of Immortals. Always born to disabled or disfigured bodies, the reincarnated Immortal would eventually stand judgment over the people. Those that treated him poorly were punished; those that treated him with love and kindness were rewarded.
Using his tremendous telepathic powers to construct a power suit (fueled with one of Graxia's purest gems), Psychozen turned on his people and slaughtered them where they stood.
He fights in the tournament not because he cares about Graxia. He fights because his taste for vengeance has not yet been sated.