Lost Mine of Phandelver
Old Owl Trouble
Daran, who introduced himself to the heroes at the feast held in their honor, had heard stories from prospectors in the hills northeast of Phandalin that someone is digging around in the ruins known as Old Owl Well. More disturbingly, several prospectors had reported being chased from the area by undead. He asks the characters to visit the ruins, a couple days march northeast of Phandalin, and find out who's there and what they're up to. Daran knows that the ruins are an old watchtower of an ancient magical empire known as Netheril, and he worries that dangerous magic might be dormant there.
Upon arriving, the adventurer's discovered that the ruin was inhabited by a Thayan necromancer by the name of Hamun Kost who was searching the tower for ancient Netherese artifacts. The adventurers stood against Hamun and his twelve zombie servants, freeing the ruin of the threat.