Hellmouths are living portals in the fabric of Hell itself, most commonly appearing as disgusting rents in the ground, devilish faces, or open orifices. They connect the various layers of Hell and are therefore heavily fortified and guarded, with a devil of at least infernal duke status assigned as overseer. A few extremely rare hellmouths connect to other planes, most commonly the Abyss, the sewers of the planar city of Axis, or a world on the Material Plane.[1]

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