Alcaeus Covington in Mysteries asked to borrow Parlington's Cestus from Tosha at some point - then vanished. I don't remember where this went, though.

The possible relevance to now, though:

"a wizard with a sufficiently advanced will can set up, in advance, a death-spell that will be automatically released at the time he dies -- as a form of 'final strike', revenge against whomever has killed him."