James Swallow
Deus Sanguinius
Blood Angels (series) part 2

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.
Warhammer 40k
novel

Also in:
Blood Angels: the Complete Rafen Omnibus