The World of Lore: Monstrous Creatures

One last thing: according to the Bulgarian folklore surrounding vamprie hunters, there was one big risk for those in the profession. Anyone who served as a sabotnik or vampirazia was most at risk of becoming a vampire themselves. Even in England, Hopkins didn`t die a hero. Instead, he was viewed as a monster and bogeyman. Rather than going down in history as some sort of heroic hunter, he acquired a reputation of having been evil himself.
Because sometimes, whether the creature is a thing of our own invention or simply the focus of a personal obsession, the hunter is always at risk of becoming the very thing they pursue.