Key to Depths

Key that allows you access to the depths.

Dropped by the Capra Demon found in the lower Undead Berg. After finishing off the demon, continue down the stairs you came from and keep following the path, dispatching any leftover assassins, until you come to a large semicircular path with a locked door at the end on the righthand side of the hallway, this is the one you want.

Be sure to bring plenty of purple moss and a couple of curse stones, the enemies up ahead are tough.