"In the distant past, mages working with witchers developed this potion specifically for use in fighting cemetery and crypt dwellers that drink the blood or eat the innards of their still living victims. Witchers use Black Blood unwillingly because the potion only works when a monster begins to feast on their body. Their transmuted blood proves to be a deadly drink."
Black Blood turns imbiber's blood into poison; blood becomes lethal to monsters which drink it.
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Three of these can be crafted at any one time and placed in the consumables slot.
See also Edit