Thralhavoc, the Shadowmaster, is an Abyssal lord whose portfolio includes undead shadows and subterfuge. It once ruled the 348th layer of the Abyss, but abandoned it to focus on more important tracts of land. Now even the name of the Abyssal layer has faded - the Guvners call it Indifference.
Sources:
Fiendish Codex I
Hellbound: War Games
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