I don't know where they come from. It seems highly unlikely that they evolved naturally into what they are now - impossible, given what we know about evolution. Perhaps they are some kind of bioweapon, created millennia ago by madmen for some long-forgotten war. If so, I suspect that their creators soon came to regret their creation. Or perhaps they come straight from the warp. Possibly the Lords of Chaos themselves cast them out because they were too unpleasant.
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