Grifo is a gnome who has been stuck in Uaigneach for millennia. He claims that he was caught up in the matter between the Sidhe Ardaithe and Rionach and imprisoned unfairly. However, Charles notices he's being cagey about details and seems to reject the authority of the Sidhe Ardaithe.
Using a magical rune on the orb there, he bound himself to the party to return to the material plane.
The party used an empowered Dispel Magic scroll to remove the fey illusion aura on Grifo. He turns out to be a dark imp--a chaotic trickster fey with grayish-green skin; wide, pointed ears; standing a little shorter than an elf.