Talk:Bellicose Knot/@comment-6529023-20131112001126/@comment-5532691-20131112004432

It's pretty common knowledge among herbologists, and it's as easy to obtain as walking up to a wall and plucking some growing along the base.

Yeah, I'd say he would know what to do with it and all, and even if he didn't, it'd only take a little bit of experimentation to find out what it did.

To answer your last question, no, the poison does not work on vampyres; the only possible harmful effects are brain damage from smoking/inhaling it for too long.