Lore:Book of Bloodfiends, Ch. 3—Flame

If one of your friends or family dies, you don't want them coming back as a bloodfiend! We found that burning the corpse is an effective deterrent to spreading the plague.

However, you have to burn the corpse black for the intended effect, so please do not try this on living people! However, a fire shield spell proved insufficient to ward the plague, as one of our valiant researchers discovered.