Key to the Depths

In Game Description

Key opening the door from the lower
Undead Burg to the Depths.

Those banished from the Undead Burg eke out
their existence in the Depths, a damp lair
with no trace of sunlight. Nearly half of
the Depths form a perilous flooded labyrinth.

Availability

Defeat the Capra Demon in the Lower Section of Undead Burg

Opens

The door in the Lower Section of the Undead Burg that leads down to Depths