He's not impossible (I think I beat him on my third go? fourth?) but it's a nasty surprise while you figure out how the mission works.

He brings a level 6 mission set in your own hamlet, with obstacles aplenty, bandits capable of proper nasty crits, and Vvulf himself at the end with wicked bombs. There's also a chance that Brigand Vvulf will come a-rampaging. Town events are random little happenings, mostly small bonuses like free medical treatments or bonus XP and damage in a certain dungeon. If it's been a while since you've raided the Darkest Dungeon, I'll explain. Good news: as of last night's update, Vvulf is now less irritating. You've likely had him return a few weeks later to do it again, highlighting the worst parts of Darkest Dungeon. You've likely had him and his pals barrel into your hamlet and light it up then lost a mercenary or two figuring out how the encounter works. If you, like me, have been playing a fair bit of Darkest Dungeon since it added town events, you've likely run into that horrible raiding git.

Wolves at the door darkest dungeon