Warden tells you, "The town of Colier is now overrun and forsaken."
Warden tells you, "It was once a mining town, now the town belongs to banderlings and drudges. The Baron Colier and his miners are in the mine below and have joined the ranks of the undead."
Warden tells you, "In the town you recover two keys before you enter the dungeon. One from a Banderling Raider Guardian and a Heavy Drudge Prowler."
Warden tells you, "In the dungoen itself you'll find more keys amongst trusted undead and in a chest. Use these to access the Baron himself and recover his necklace."
Warden tells you, "Return to me with the necklace and I'll reward you."