The seventh layer of the Abyss is a vast swamp ruled by the demon prince Sess'innek. Inhabited by lizard kings and various giant reptiles, the layer got its moniker "The Phantom Plane" because Sess'innek had sealed off all the gates leading to this layer. No portals from the first layer reach Kearackinin, leading many to think the place no longer exists. The demon prince has strict control over what enter or leave the layer, as a result, Sess'innek, unlike most demon princes, is less occupied with repelling invading hosts from rival demon lords.

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