The Blood Angels chapter is on the verge of being torn apart by a religious schism in their midst. Brother Arkio claims to be a reincarnation of Sanguinius, the Blood Angels' primarch, and spiritual father, and has laid down the law: follow me, or die.Arkio's brother, Rafen, must decide where he stands in the conflict in the explosive conclusion to the Blood Angels saga.

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Following his triumphs against the forces of Chaos on the planet Cybele, Brother Arkio of the Blood Angels is being worshipped as the reincarnation of the Chapter's primarch, and a rift is growing which threatens to divide and destroy the Chapter.