Warhammer 40K - Core Rules

In the grim darkness of the far future, Humanity teeters upon the brink of extinction. The Galaxy-spanning Imperium, beset on all sides by ravening aliens, foul traitors, and warp-spawned daemons, looks once more to its greatest warriors to stave off the encroaching darkness. There is no time for peace. No respite. No forgiveness. There is only war.