Harbinger

Harbinger can be described as Diablo in space. The game takes place aboard the vast slave spaceship Harbinger. A small band of outcasts is running free aboard Harbinger, trying to wrest control from the ship’s Overlord.
There are three character classes to choose from in the game: Human, Gladiator (a cyborg-like robot infused with the consciousness of a living being), and Culibine who resembles Diablo’s sorcerer character.