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Innate Spellcasting. Atemos’s spellcasting ability is Charisma (spell save DC 21, +13 to hit with spell attacks). He can innately cast the following spells, requiring no material components.

At Will: Fear, Jump, Detect Magic, Spiritual Weapon

3/day: Dispel Magic, Invisibility, Hunter’s Mark

2/day: Teleport, Dominate Monster

Legendary Resistance (3/Day). If Atemos fails a saving throw, he can choose to succeed instead.

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

Magic Weapons. Atemos’s weapon attacks are magical 

Rampage. When Atemos reduces a creature to 0 hp with a melee attack on his turn, he can take a bonus action to move up to half his speed and make a bite attack.

Aura of Bloodthirst. If Atemos isn’t incapacitated, any creature with the Rampage trait can make a bite attack as a bonus action while within 20ft of him.

Multiattack. Atemos makes three flail attacks and one bite attack. If a flail attack hits, he can cause it to create an additional effect of his choice or at random.

1. The attack deals an extra 5d12 (30) bludgeoning damage.

2. The target must succeed on a DC 21Constitution saving throw or be paralyzed until the start of Atemos’s next turn.

3. The target must succeed on a DC 21 Wisdom saving throw or be affected by the confusion spell until Atemos’s next turn.

Flail. Melee Weapon Attack, +18 to hit, reach 15 ft, one target, Hit: (34) 4d12+10.

Bite. Melee Weapon Attack, +18 to hit, reach 5 ft, one target, Hit: (20) 2d10+10 damage. If shapechanged into Atemghu, bite damage increases to (30) 4d10+10. If Atemos is shapechanged into Atemghu form and the target is a creature, it is grappled, escape DC 25 Dexterity. Until this grapple ends, the target is restrained, and Atemos can't bite another target.

Whip. Atemos extends the reach of his flail to 60 ft and makes an attack against a single creature. It must succeed on a DC 26 Strength check or be pulled within 5 ft of Atemos.

Frightful Presence. Each creature of Atemos’schoice that is within 120ft of him and aware of his presence must succeed on a DC 23 Wisdom saving throw or become frightened for 1 minute.The save is made with disadvantage if Atemos is in Atemghu form. A creature can repeat this saving throw at the end of their turn, ending the effect on a success. The creature is then immune to his frightful presence for the next 24 hours.

Shapechange. Atemos shapechanges into Atemghu. This increases his bite damage, raises his speed to 65 ft, and raises him a size class to Huge. He also gains the ability to use swallow.

Swallow. If a bite attack hits against a Large or smaller creature that is grappled and Atemos is polymorphed into Atemghu, the target isswallowed. The swallowed target is blinded and restrained, it has total cover against attacks and other effects outside of Atemghu, and it takes 10d10 (50) acid damage at the start of each of Atemghu’s turns. Atemghu can only swallow one target at a time.

If Atemghu takes 30 damage or more on a single turn from a creature inside him, he must succeed on a DC 21 Constitution save or regurgitate the swallowed creature, who falls prone within 15 ft of him. If Atemos dies, a swallowed creature is no longer restrained by him and can escape from the corpse using 15 feet of movement, exiting prone.

Redirect Attack. When a creature that Atemos can see targets him with an attack, he can choose another willing demon, gnoll, hyena, or ghoul within 15 ft of him. He swaps places with it and the chosen creature becomes the target instead.

Atemos 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. Atemos regains spent legendary actions at the start of his turn.

Impale(2). Atemos causes an iron spike (up to 30ft in height and 6 inches in diameter) to burst from the floor within 100 ft of where he can see. Any creature in that space must make a DC 25Dexterity saving throw. On a fail, the creature takes 6d8 (24) piercing damage and is restrained. A creature can use its action to remove itself from the spike. 

Swat Away. Atemos makes a flail attack. If the attack hits, the target must succeed on a DC 26 Strength saving throw or be pushed 15 ft away and knocked prone.

Charge. Atemos moves up to his speed.

Savage(Only Atemghu form). Atemos makes a bite attack against every creature within 10 feet of him. He chooses the one that he wants to grapple.