The Labyrinth (Heroes of the Space Marines)

The Sons of Malice, once loyal Space Marines, have turned from the Emperor, their faith corrupted. The Doomed Ones are their holy warriors, who do their dark lord's bidding. A group of recruits take the trial to join this elite group, braving a dangerous labyrinth full of devious traps and monstrous creatures. Only one can survive, and only the most cunning and brutal can be that one.