Vampire Poison Resist

"How?" I asked. "I thought they weren't poisonous."

"Singly, they are harmless," Seba explained. "But if they attack in groups, they can be dangerous. Death is unlikely — for a human, maybe, but not a vampire — but certainly severe discomfort occurs, possibly even partial paralysis."

***

Cirque Du Freak: Trials of Death, Chapter 9