Devil's Sight. Magical darkness doesn't impede the devil's darkvision.

Magic Resistance. The devil has advantage on saving throws against spells and other magical effects.

Hellflame Aura. A creature that touches the Aberration or hits it with a melee attack while within 5 feet of it takes 6 (1d6) fire damage. This also gives the Aberration of Rage a +4 to AC at all times.

Multiattack. The devil makes three melee attacks: two with its fork and one with its tail. It can use Hurl Flame in place of any melee attack.

Hellish Greatsword. The Hellish Greatsword does 2d12 Slashing damage and 8d6 fire damage. This has a +7 to hit.

Hurl Flame. Ranged Spell Attack: +7 to hit, range 150 ft., one target. Hit: 14 (4d6) fire damage. If the target is a flammable object that isn't being worn or carried, it also catches fire.

Claws. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 20 (2d12 + 6) slashing damage.

Rage of Hellfire. The Aberration can burst into a rage where they do 2d4 damage and gain a +5 to hit on all physical attacks. This affect last for 5 rounds and cannot be undone with magic.