Crooked Turn. Adomi may make two Claw attacks before her first turn of the combat.

Aura. Adomi has an aura of dread surrounding her. When creatures end their turn within 10ft of Adomi, they take 1d6 Necrotic damage and must make a WIS Saving Throw (DC 20) or take 1d8 Psychic Damage.

Spell Scroll. Adomi has 3 spell scrolls of Invisibility (2nd Level). She can use these as a Bonus Action.

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

Spellrend. When Adomi damages a Creature who is concentrating on a spell, the Creature makes their concentration check with disadvantange.

Multiattack. Adomi can make one Bite, two Claw and one Tail attack.

Bite. Melee Weapon Attack: +13 to hit, reach 5 ft., 1 target. Hit: 16 (3d6 + 7) Piercing damage. A Creature must make a CON Saving Throw (DC 20) or be Poisoned until the end of their next turn and take 2d12 Poison Damage, taking only half damage on a success.

Claw. Melee Weapon Attack: +13 to hit, reach 5 ft., 1 target. Hit: 13 (2d6 + 7) Slashing damage. A Creature's hit point maximum also decreases by the damage deal until their next long rest.

Tail. Melee Weapon Attack: +13 to hit, reach 10 ft., 1 target. Hit: 22 (3d10 + 7) Bludgeoning damage. Adomi adds an additional weapon damage die to the attack for every 10 ft she moved that turn before taking it. 

Concentrated Strike (8). Adomi targets one Creature within 10 ft of her. That Creature makes a CON Saving Throw (DC 20) or is dropped to 0 HP. On a success, the Creature takes 8d10 Necrotic Damage. 

Cunning Action. Adomi can Dash, Disengage or Hide.

Nimble Evil. Adomi can Dodge. When she does so, she heals 3d6 HP.

Deflect Energy. When an attack roll hits Adomi or an Allied Creature within 5 ft of her, she can take a Reaction to reduce the attack’s total damage against her. The reduction equals 1d12+7. 

Adomi has 3 Legendary Actions to use per turn.

Attack (Costs 1). Adomi can make one melee attack. 

Move (Costs 1). Adomi can move up to her movement speed. This does not provoke Attacks of Opportunity. 

Disperse (Costs 2). Adomi disperses into a mass of rats. All Creatures within 30 ft must make a DEX Saving Throw (DC 20) or take 10d6 Piercing damage. Creatures take half damage upon a success.