Athux, Commander of Graz'zt's Legion

Sunlight Sensitivity. While in sunlight, Athux has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

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

Magic Weapons. Athux's weapon attacks are magical.

Aura of Command. Athux exudes an aura of dread and command in a 30-foot radius. Allies within this aura have advantage on saving throws against being charmed or frightened, and enemies have disadvantage on saving throws against fear effects caused by Athux.

Demonic Regeneration. Athux regains 20 hit points at the start of his turn if he has at least 1 hit point.

Innate Spellcasting. Athux's innate spellcasting ability is Charisma (spell save DC 22, +14 to hit with spell attacks). He can innately cast the following spells, requiring no material components:

At will: disguise self, detect magic, darkness, levitate (self only)

3/day each: faerie fire, greater invisibility, teleport

1/day each: dominate monster, globe of invulnerability, power word stun

Multiattack. Athux makes three attacks with his Abyssal Greatsword.

Abyssal Greatsword. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 21 (3d8 + 8) slashing damage plus 14 (4d6) necrotic damage.

Infernal Command. Athux targets one demon he can see within 60 feet of him. The target must succeed on a DC 21 Wisdom saving throw or be charmed by Athux for 1 hour. While charmed in this way, the demon regards Athux as its absolute master, following his commands without question. If Athux uses this ability on a demon with a challenge rating of 15 or higher, the demon has advantage on the saving throw. The effect ends early if Athux or his allies attack the demon.

Fiery Strike (Recharge 5–6). Athux channels the fiery wrath of the Abyss into his weapon. Until the end of his turn, his Abyssal Greatsword deals an additional 21 (6d6) fire damage on a hit, and creatures within 10 feet of the target take 10 (3d6) fire damage.

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

Attack. Athux makes one attack with his Abyssal Greatsword.

Command Ally. Athux targets one ally he can see within 60 feet. That ally can use its reaction to make one weapon attack or move up to its speed.

Unholy Fire (Costs 2 Actions). Athux exhales a wave of fire in a 30-foot cone. Each creature in the area must make a DC 21 Dexterity saving throw, taking 35 (10d6) fire damage on a failed save, or half as much damage on a successful one.