Much like how Blood Magic can be used to incidentally, or purposefully, summon demonkind, it can also be used to summon these beasts. They faithfully serve the summoner for one task, as long as they sense good intentions. If used for ill, the Blood Beast will taint the blood of the summoner, causing them to wake up each day in Torment, and as long as they remain alive, their immediate blood relatives will slowly succumb to the curse as well, and on top of that all, the summoner cannot produce any children.
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Next: Blood Spirit