The Riven Veil [Warhammer 40,000]

A deadly serious sci-fi thriller by an author who understands religion, monasticism, and violence... and got tired of official Sisters of Battle fiction that doesn't. 106k words, finished, updated daily.  No prior knowledge of Warhammer 40k is required. This is a standalone story with original characters, written out of love for the official setting and frustration with how much of what's moving about it is left unexplored.  A fireteam leader of the Adepta Sororitas encounters an enemy that can attack belief itself.