Armor Class 16
Hit Points 161 (17d10 + 68)
Speed 40 ft., fly 40 ft.
Saving Throws STR +8, INT +5, WIS +6, CHA +7
Skills Deception +7, Insight +6
Damage Resistances cold
Damage Immunities fire, poison
Condition Immunities poisoned
Senses Darkvision 120 ft. (unimpeded by magical {@variantrule Darkness|XPHB}), passive Perception 12
Languages Infernal; telepathy 120 ft.
Challenge 9
Diabolical Restoration. If the devil dies outside the Nine Hells, its body disappears in sulfurous smoke, and it gains a new body instantly, reviving with all its Hit Points somewhere in the Nine Hells.
Magic Resistance. The devil has Advantage on saving throws against spells and other magical effects.
Multiattack. The devil makes two Claw attacks and one Infernal Sting attack.
Claw. m +8, reach 10 ft. Hit: 13 (2d8 + 4) Slashing damage.
Infernal Sting. m +8, reach 10 ft. Hit: 15 (2d10 + 4) Piercing damage plus 18 (4d8) Poison damage, and the target has the Poisoned condition until the start of the devil's next turn. While Poisoned, the target can't regain Hit Points.
Monster Manual (2024), p. 52