Arrant Nonsense

No ideas on the first, but as to the second, you might want to research other things that were traditionally used in folkloric werewolf transformations. You know, of the sell-your-soul-to-satan-and-smear-this-nasty-ointment-on-your-body variety--I think wolfsbane was often an ingredient, but there were other things too, which...I forget, mostly. Mistletoe maybe? Any of this stuff would be good if it also relates in folklore to vampires somehow, I imagine, although anything that would poison an ordinary human (wolfsbane fits that, for sure) would probably count for double with a werewolf or...something. Of course you could just have a silver-tipped crossbow bolt too, since obviously that's bad for werewolves and also related in folklore to killing vampires.