Freeing vengeful fae specters sounds like a good way to spread chaos. He's in.

If he sealed one and brought with him back to Loch Manor (aka "home") would the spirits there sense the sealed one? If so would they react to it?

edit: Oh! And the Celliwig thing. Do they know how people acted in the trials and would their interactions with non-humans be any different?

second edit (sorry, I love you): Do their familiars come with them? And if yes what happens if an undead familiar drinks from the fountain?