Undertaker

Undertaker is a dungeon unique to the Super Nintendo port of Ultima VII.

Description
Undertaker lay deep within the sub-basements of Serpent's Hold, where it interconnected with the nearby Dungeon of Serpents on the neighboring Fellowship Isle. A dark cavern where fetid swampland and hot magma both existed in close proximity of one another, Undertaker was impossible to enter without the protection of a Caddellite Helm, owing to the piercing shriek emitted by the Guardian's Cube Generator which lay within its passages.

Needing to dismantle this strange construct in the course of their quest, the Avatar obtained such a helmet from the depths of the Dungeon Covetous, and successfully shattered the blackrock cube - severing the Red Titan's primary means of communication with his followers