Sess'innek is a Tanar'ri Abyssal+Lord who has grown wary of the Blood War. He has turned his attention to displacing Semuanya as the Power of the lizardmen by creating the Lizard Kings, corrupted lizardmen.
He is the master of the Phantom Plane.
Sources:
Monster Mythology
On Hallowed Ground
Serpent Kingdoms
Fiendish Codex I
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