Glover Mallory says that Esmond Tyne took his formula for bonemold and has not yet returned it. He gives the quest to recover the formula. Esmond was last seen in the Castle Karstaag Caverns.
Upon entering the caverns, the path proceeds west next to a small stream. It then turns left (south), where the floor ends and ice-filled water begins. There are several rieklings present in the area. On the left (east) side is an ice shelf with the corpse of Esmond Tyne. It can be looted for the Bonemold Formula. Reading the note grants the ability to forge Improved Bonemold Armor at a forge.