I want to build an NPC villain inspired from the Dune character, Baron Vladimir Harkonen. Said character is an extremely sadistic, cruel, corrupt noble who is ugly and so fat he uses a flying chair to move.
Note that while Dune is a Sci-Fi setting, we're are in an classical fantasy adventure, so he use magic instead of technology. For keeping him as a threat I'd like to make him a spellcaster of some kind; his physical abilites are limited by his obesity. Alternately, I could see making him a threat with just magical items and an UMD score, since he is super-rich he can afford them; my concern with that route is I don't want to give him too much equipment because the players could manage to loot it.
Social skills are not required, but bluff and intimidate are in character so I'd like some.
Ideally, he would use some form of magical flying 'chair' and have inhibited movement.
It would be an cr 12 encounter, knowing he have a few guards (at least 2 fighters lvl 10). The baron himself would be lvl 9-10 with pc wealth. Maybe a little more than PC wealth but i can't find rules for calculate the cr of that.