The Nine Hells

The Nine Hells, plane of tyranny. The devils' existence is one part Blood War, one part internal affairs as they navigate their own politics and bureaucracy. Asmodeous runs the hells in a bizarrely randian fashion. Competition is encouraged, rather than strict obedience to one's superiors. Said competition usually involves backstabbing and sabotage rather than any kind of efficiency, but for whatever reason, Asmodeous doesn't seem bothered by this. Perhaps the possibility of promotion keeps the rank and file from revolting. Of course, it's still mostly fascism. Dissent is suppressed, punishments are severe, and every populated part of the plane is riddled with monuments to the devils' power. Unlike the Abyss, many petitioners arrive in the Nine Hells without becoming fiends, and are subsequently enslaved alongside any living creatures the devils can get their hands on. These petitioners are usually transformed into tieflings. Devils see the Abyss as unnatural blight on reality. From their point of view, they are the true fiends, and the lower planes rightfully belong to them just as the upper planes "belong" to the angels. The Abyss, they reason, is an
unnatural blight on the perfect order of the universe, and it's their duty to correct that error. And then take over the universe after they've done that. The war effort is what keeps the plane running. If the demons were destroyed, the war machine of the Hells would turn on the celestials, and so on until they controlled all things and then turned on themselves in a bloody civil war. The Nine Hells needs war. Fortunately for everyone else, the devils are no closer to defeating the Abyss than they were 10,000 years ago. If anything, they're on the defensive side more often than notbut who knows what tricks Asmodeous has up his sleeve.
 
Ideal: Wickedness, premeditated cruelty and corruption. Trait: At the end of each long rest on this plane, a visitor must make a DC 10 Wisdom save or sprout horns and a tail. While in this cursed state, any other creature can use its action to force the victim to make a Wisdom (Insight) check contested by its own Charisma (Intimidation) check. If it wins, the victim must follow its orders to the letter until the end of its next turn, unless such orders are obviously harmful to itself. A dispel evil and good spell removes this effect.