In the darkness of the forty-first millennium, mankind is assailed on all fronts by perfidious aliens, degenerate traitors, and treacherous rebels. There is no escape from the horror and slaughter, the only alternative is to meet the threats and defeat them. This is the destiny of the Space Marines of the Adeptus Astartes, fearless champions of humanity and unforgiving crusaders against the enemies of the Emperor of Mankind.