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The Undershell.

The Undershell[38, 42] is a big cave directly under L'ghorek in the Abyssal Depths. Its entrance is located in the Scalding Chasm. Inside the cavern there are three powerful ogre magiUr'Goz, Sku'Bu, and Neph'Lahim — maintaining a ritual that connects L'ghorek to an immense unnamed creature far below.[1]

The cavern is also filled with Nether Fiends, which were summoned from the netherworld by the ogre magi to defend them.[2]