The Geas of Thrundarr
The Lich defeated by the party in the Beastlands
When defeated by the party, Rasselya vowed vengeance. Too disgraced to return to the Order, Rasselya instead chooses to hound the party, waiting for an appropriate opportunity to strike. The players should be on their guard.
Currently however, this will have to wait, as he has yet to remanifest on the Prime Material Plane.