Amon, Wolf of Hell

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

Innate Spellcasting. Amon's spellcasting ability is Charisma (spell save DC 20). Amon can innately cast the following spells, requiring no material components:

At will: charm person, detect magic, dominate person, fly, ice storm, polymorph

3/day each: animate dead, geas, hold monster, mislead, wall of ice

1/day each: Otiluke's freezing sphere, teleport

Magic Resistance. Amon's has advantage on saving throws against spells and other magical effects.

Magic Weapons. Amon's weapon attacks are magical.

Pack Tactics. The devil has advantage on an attack roll against a creature if at least one of the devil's allies is within 5 feet of the creature and the ally isn't incapacitated.

Multiattack. The devil can use its Frightful Presence. It then makes three attacks: one with its bite, one with its claw, and one with its mace.

Bite. Melee Weapon Attack: +12 to hit, reach 5ft., one target. Hit: 20 (2d12 + 7) piercing damage plus 22 (5d8) cold damage and the target has disadvantage on attack rolls until the end of its next turn.

Claw. Melee Weapon Attack: +12 to hit, reach 10 ft. , one target. Hit: 17 (2d8 + 8) slashing damage.

Mace. Melee Weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 22 (2d8 + 11) bludgeoning damage. This mace also serves as a fiendish thrower described in the fiendish thrower side bar.

Frightful Presence. Each creature of the devil's choice that is within 120 feet of the devil and aware of it must succeed on a DC 20 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the devil's Frightful Presence for the next 24 hours.

Retaliation. When the devil is hit with an attack, it can make a bite attack against the creature that hit it.

The devil can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.

Mace Attack. The devil makes one mace attack.

Cast a Spell (Costs 2 actions). The devil casts a spell from its innate spellcasting trait.

Summon Devil (Costs 3 actions). The devil magically summons one ice devil or 2 (1d4) barbed devils. A summoned devil appears in an unoccupied space within 60 feet of Amon, acts as an ally of Amon, and can't summon other devils. It remains for l minute, until it or Amon dies, or until Amon dismisses it as a bonus action.