I have finished the main story and several other stories and now I am completing my "Miscelanious", including some old tasks that I don't even remember how I got.

The thing is. There is one task called "return the item to Sergius Turranus". I went to Winterhold and Sergius Turranus is now an ash pile. I suppose he died when a Dragon attacked Winterhold and killed the Arch-Mage. Now, I don't remember which item I have to deliver (that is, store in his ash pile) and I don't know why this quest is still active if he is now an ash pile.

Please help!