The opening of the Great Rift that rent the galaxy in two was preceded by an era of dark portents and momentous events. Seers and mystics went mad with fear – they raved about an unstoppable confluence of nightmares, of black storm clouds gathering to blot out the light of hope. It was a time of desperate heroics, of grand triumphs and bitter defeats, all turning about the inexorable wheel of fate.

In the wake of that great calamity, Humanity faces existential threats from traitors, heretics, and xenos empires on all sides. Imperial defenders are stretched thin as they react to Ork invasions, the reawakening Necrons, the expanding T’au Empire, and worse. Into this maelstrom of conflict enters a threat long thought defeated – that of the Tyranid Hive Fleets. These hordes of ravening, ever-adapting lifeforms attack the Imperium from unexpected quarters – can Humanity’s warriors beat them back, or will the invaders forge a path to Holy Terra itself?