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Gore crows are a form of Dead Hand, involving any number of normal crows killed by a Necromancer, then imbued with a spirit from Death. This may be one spirit shared among the entire flock, or simply a single crow with a single spirit. The more crows share a spirit, the more quickly the corpses erode. When there's a whole flock of gore crows shared by one spirit, if you banish one crow into Death then the rest of the crows will be sucked in after it.