Stop me if you've heard this one. 

Lucius Bochs, uncrowned King of Nessus, the lowest of 9  layers of the City of Sheol,  built inside an active volcano that protects the city from a frozen devastated world outside. A mountain of a man in a white suit, a barbarian cloaked in civility. The Bochsers are his enforcers, and he controls the lion's share of crime in  Sheol.

A very dangerous BBEG for a Noir Urban setting like the one outlined in DC Bradshaw's Hardboiled Adventures. 

https://www.dmsguild.com/product/315142/Hardboiled-Adventures?filters=45469_0_45393_0_0_0_0_0 

PDF here, will check actual Cr and convert to statblock soon: https://www.patreon.com/posts/74544484