Black Blood



"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.

Source

 * The Book of the Golden Oriole

Černá krev Schwarzes Blut Sangre negra Recettes des Elixirs Sangue nero Fekete Vér Eliksir Czarna Krew Черная кровь