Asmodeus
From Ardrana
Asmodeus, arch-fiend, the Overlord of all the dukes of Baator, rules by both might and wit. He is physically stronger than any other devil and the most cunning and artful. His mighty palace rests upon the floor of the lowest rift in Hell's ninth plane, Nessus.
Note: Asmodeus originally appeared in this form in the 1st Edition Monster Manual for the AD&D game from TSR. His use here is for the purposes of providing context for the campaign only.