Biru, The Azure Mistress

Innate Spellcasting. The Azure Mistress's innate spellcasting ability is Charisma (spell save 23,  + 16 to hit with spell attacks). The Azure Mistress can innately cast the following spells, requiring no material components:

At will: charm person, command, counter spell

3/day each: dominate person, hypnotic pattern

1/day each: dominate Monster, feeblemind

Legendary Resistance (3/Day). If the Azure Mistress fails a saving throw, it can choose to succeed instead.

Corruption. As a bonus action, the Azure Mistress targets one creature it can see within 90 feet of it. The target must make a DC 23 Charisma saving throw. An evil creature makes the save with disadvantage. On a failed save, the target is charmed by the Azure Mistress until the start of the Mistress' next turn.

Heart Shatter. When ever The azure Mistress deals damage to a target that is charmed the target takes an additional 28 (5d10) psychic damage The Azure Mistress heals based on half of the psychic damage dealt by this effect. a charmed creature can attempt a DC 23 Charisma saving throw to attempt to remove the current charmed effect. 

Multi attack. The Azure Mistress uses Alluring visage. it also makes three attacks two with its lash and one with its touch. 

Lavish Lash. Melee Weapon Attack: +16 to hit, reach 15 ft., 1 target. Hit: 18 (2d8+ 9) slashing damage. 

Touch of Decadence. Melee Weapon Attack: +16 to hit, range 5 ft., 1 target. Hit: 44 (8d10) Necrotic damage.

Alluring Visage. The Azure Mistress targets up to two creatures that it can see within 60 feet of it. Each target must succeed on a DC 23 Wisdom saving throw or take 26 (4d12) psychic damage and be charmed until the start of the Mistress’ next turn.

Forgetfulness (Recharge 6). The Azure Mistress targets one creature it can see within 60 feet of it. That creature must succeed on a DC 19 Intelligence saving throw or become stunned for 1 minute. A stunned creature repeats the saving throw at the end of each of its turns, ending the effect on itself on a success. If the target is stunned for the full minute, it forgets everything it sensed, experienced, and learned during the last 5 hours.

Instinctive Charm. When a creature within 60 feet of the Azure Mistress makes an attack roll against it, and another creature is within the attack’s range, the attacker must make a DC 23 Wisdom saving throw. On a failed save, the attacker must target the creature that is closest to it, not including the Azure Mistress or itself. If multiple creatures are closest, the attacker chooses which one to target. If the saving throw is successful, the attacker is immune to the Azure Mistress Instinctive Charm for 24 hours.

The Azure Mistress 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 Azure Mistress regains spent legendary actions at the start of its turn..

Siren's Calling (Costs 1 Actions). The Azure Mistress chooses one creature it can see within 60 ft of it and force them to make a DC 23 wisdom saving throw or become charmed by the Azure Mistress. the creature charmed by this effect must use all of its movement to get closer to the Mistress. 

Shifting Tides (Costs 1 Action). The Azure Mistress can teleport itself and two allies to a point it can see within 60 feet of it.

Bleeding Hearts (Costs 3 Actions). The mistress can select up to 8 other creatures it can see within range each must make a dc 23 constitution saving throw or take 2d6+9 psychic damage and becomes vulnerable to psychic damage till the end of the Mistress next turn. half as much on a successful save and they are not vulnerable to psychic