Litanies of Faith in general or just of sob? There are verry little fluff on anything to do with the sisters. The witch Hunters codex coming out soon should be a good source. I recommend getting the old SOB codex if you don’t already have it! There is some fluff I and others have put up on the Army Fluff Forum but its gonna be old by now, and the Fede Imperialis. Most stuff will have to be made up by the gammer themselves, which can be easy enougth.
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