I'd love to be a member of a group of undead/lycanthrope/vampire/daedra hunters. I see them all over the place tangling with different beasties, have been to their HQ, but there doesn't appear to be a way to join them.
Is it possible?
If not I'll settle for dead thralling a couple of foxes- I'll have to try that out tomorrow...

Everytime my Dunmer Vampire Assassin meets one, he/she always sprints over to me to try to be the one who finally kills me... with the way those battles typically go, I don't there are any Vigilantes left in Skyrim. lol

You can join them in Spirit, or you can be Adjunct Stendarr. Just kill the Vampires, Undead and Daedra you see.

Yup, that's what I'm doing. I also jump in and help them when I see them in battle.