The walls have fallen. The defenders are broken. The inner palace lies in ruins. Through the fire and ashes of a dying Terra, the Warmaster's horde advances, and the troops loyal to the Emperor are forced to retreat to the Delphic fortification - to the very walls of the Sanctum Imperialis. Angron, Primarch of the World Eaters and Herald of Horus, died and was reborn immortal, and now he leads the armies of the damned like an angry tide, destroying everything in his path, while the Warp poisons the very soil of Terra. There was no hope left for the besieged armies of the Emperor. Khan is on the verge of death. Rogal Dorn is surrounded and continues the war in the Bhab Bastion. Guilliman won't have time to get to Terra. Without his brothers, Sanguinius - Angel of the Ninth Legion - waits on the final wall, hoping to unite desperate defenders and refugees for a final battle.