Lucius the Eternal, the finest swordsman in the Emperor's Children and champion of the primarch Fulgrim, faces his greatest enemy... himself.

He is Fulgrim's champion, the Soulthief and the Scion of Chemos, a peerless blademaster whom even death cannot threaten. His name is whispered and cursed across both time and space. He is Lucius the Eternal, blessed by Slaanesh and the greatest swordsman of all the fell Legions imprisoned within the Eye of Terror. With his armies exhausted by unending war and consumed by their own twisted iniquities, Lucius turns to an erstwhile brother of the Emperor's Children to rebuild his strength. Faced with betrayal from without and even from within his own flesh, will Lucius discover something that even one who cannot know death should fear?