The Unfinished Lay
Lindir of the Hall of Fire put this into your hands without a word of instruction beyond the obvious one: it is not finished, and he is not going to finish it. You are to carry it about the world until something happens to you that belongs in it, and bring it back to Rivendell when it does.
Where to find
Not found in any store, container, creature inventory, or script reward — this item may be inaccessible to players.