He *is* a lich, so any with the Crusade trait might experience a nice bonus. As would any elves, with their quick learner trait -- the additional XP is very noticable, I have to say.
For the most part, anyone who can give you a special object (Kerielle's elixir, dungeon key, vampire ring, assassin's dagger, etc.) will not have it in their inventory. If you kill them before receiving it, you're done
