Anvil of Fury (Quest)

This quest involves locating a powerful artifact, the Anvil of Fury. The quest is initiated by Griswold anytime after first entering the cave section of the Labyrinth. The anvil itself is located on a peninsula on dungeon level ten, and is guarded by several Goatman Archers as well as Horned Demons. Once it is found, the hero must return it to Griswold to complete the quest. As a reward, Griswold will forge his namesake sword: Griswold's Edge.

Diablo III
This quest is revisited during The Darkening of Tristram in Diablo III. It is simplified: one simply needs to fight their way to the Anvil and open it, receiving as a Magic item in result.