Warhammer 40.000 - Black Library: Ahriman, Undying (HB) BL3201

Adrift in a forgotten sub-realm of unknowable dimension and aspect, Ahriman has finally found the Key of Infinity. This should be his victory, but he is betrayed, lost, stripped of allies, and witness to the shattered remains of his grand plans. To save his future, he must fight through the shattered remnants of his past in Ahriman, Undying by John French, which will be available to pre-order in paperback next week.