I’ve been asking myself that for a long time now since almost every fantasy based game/book/film etc. has them.
All that I know of this case is that there were a few enemies called vampires in gw1 but they don’t actually look like the typical one. Also I know that norn can shapeshift into one of the spirits of the wild of which one is a wolf form but again it works different from the actual werewolf concept. Like for example when a norn transforms they do it willingly (not tied to what phase the moon currently is in) and they still retain control of themselves while transformed.I know that in the elder scrolls this is quite similar when it comes to werewolves but still there are a lot of things different.
I'm currently trying to develop a new character and their backstory and I'd like to go with one of these tropes but I'd like to construct it as lore friendly as possible.
So if anyone knows more about this or has a theory of their own feel free to share.
I'm Hunter, he/him
Character infos: https://is-it-because-im-charr.tumblr.com/charactersgw2