Phthor

The return to the caverns of Chthon! The planet Chthon was a prison world of ruby caverns where rebels and outlaws were exiled to endless darkness. Aton's crime was loving a minionette, one of the sensuous woman warriors it was death to touch. His son Arlo was both minion and human. Arlo's destiny was war with the deadliest enemy of all - the very planet Chthon, which was alive and furious at the life forms within its depths.