The Talvir Chronicles:
Iron Father Roancoro Divelius was a leader of Clan Nachtmore of the Iron Hands Chapter of Space Marines. One day, everyone in the clan started to go insane. The weak were either killed, or expunged. Now, two factions have come to the Talvir Cluster. Machina Proktec, who want to use the resources Divelius set up for themselves; and Espiritus Extermin, who deem the sector too dangerous to be left in tact.