Asmodeus the Archfiend

Devil's Sight. Magical darkness doesn't impede Asmodeus's darkvision.

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

Command Fiends. during Asmodeus's turn, all fiends within sight take an additional turn, doing what Asmodeus would wish them to do.

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

Fork. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 15 (2d8 + 6) piercing damage.

Tail. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 10 (1d8 + 6) piercing damage. If the target is a creature other than an undead or a construct, it must succeed on a DC 17 Constitution saving throw or lose 10 (3d6) hit points at the start of each of its turns due to an infernal wound. Each time Asmodeus hits the wounded target with this attack, the damage dealt by the wound increases by 10 (3d6). Any creature can take an action to stanch the wound with a successful DC 12 Wisdom (Medicine) check. The wound also closes if the target receives magical healing.

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.

Asmodeus's Spite.

Asmodeus chooses a creature within sight. Whenever Asmodeus or another fiend attacks that creature, they immediately succeed rolls to hit that creature. Asmodeus can only use this action if they are at full hit points.

Asmodeus's Strength.

Asmodeus chooses a creature within sight. Whenever Asmodeus or another fiend succeeds to hit to that creature, they immediately deal critical damage. Asmodeus can only use this action if they are at full hit points.

Asmodeus's Icy Gaze

Asmodeus chooses a creature within sight. Whenever Asmodeus or another fiend deals damage to that creature, they take an additional 1d6 psychic damage. Asmodeus can only use this action if they are at full hit points.