So I brought the codpiece to the vampires, and after winning the battle they said that the next time I met them, they would do something about it. But the next encounter with them was exactly the same, so the quest really isn't completed yet, end of story. Maan that was a lot of walking back and forth, even using town portal scrolls and carriages (and getting buttfucked just for the sake of skipping battles
). I think the game needs a carriage to and from the endgame fort, at least after you first encounter it.