The saga of WARHAMMER 40,000 comes to Marvel Comics! In the grim darkness of the far future, there is only war. Marneus Calgar, the legendary Chapter Master of the Ultramarines, leads his elite Space Marines against humanity's greatest threats in a galaxy engulfed in endless war. Writer Kieron Gillen (UNCANNY X-MEN, JOURNEY INTO MYSTERY, The Wicked + The Divine) spearheads a new publishing initiative with Marneus Calgar's never-before-told origin story - from his beginnings on Nova Thulium and his campaigns in the Black Crusades, to the unfolding mystery of the Black Altar, as a deadly threat from Calgar's past re-emerges to threaten the present of the Ultramar system! It's essential reading for 40K afficionados - and the perfect primer for those new to the universe of WARHAMMER 40,000! Be prepared!.