Seek out Cavalier Durkon at the Wintergarde Crypt in Dragonblight.
After the Scourge breached the south wall, I ordered Cavalier Durkon to investigate the town crypt. Moments ago I was handed his report.
The undead that plague us are coming from two sources: the ruins of Wintergarde, now a breeding ground for Scourge, and our very own town crypt! Amidst the chaos and confusion the Scourge managed to get a necrolord inside the crypt.
In his message, Durkon requested assistance. You will find him and help him, <name>. The crypt is on the western border of the town square.