A serious weather-worn dwarf approaches your group with a tale of a lazy, sleeping dragon that can't be bothered to protect his own hoard. He has a few valuable items to prove his claim. Interested?
Sauron has invested a great amount of time & power into your making. Your are his most powerful servants. He expects & demands great things from you. Don't disappoint.
A dusty scroll found in a rarely used library & a soldier's military report indicate that there may be an unclaimed treasure hoard waiting to be claimed. Are you up to the task?