A warhammer with liquefying powers.
Forged from the stuff of legends by a great Sacre-Sorcerer. Grants the wielder a variety of different powers throughout the day and night.
A casual remark by one of the party about something met on a previous adventure leads to a summons to and grilling by the Mages' Guild (or equivalent), probably resulting in an expedition back to that area to recover the things for 'study' by the Guild. The party's presence will be 'requested' for this expedition.