Alluring Siren

Amphibious. The siren can breathe both air and water.

Innate Spellcasting. The siren's innate spellcasting ability is Charisma (spell save DC 16). It can innately cast the following spells, requiring no material components:

At will: charm person, minor illusion,disguise self

1/day: mass suggestion

Legendary Resistance (2/day). If the siren fails a saving throw, it can choose to succeed instead.

Multiattack. The siren makes two attacks with her claws.

Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.

Song of Desire. A target humanoid creature within 60 ft of the siren, that can hear her, must succeed on a DC 16 Wisdom saving throw, or is charmed for 1 hour. The siren controls the actions of the charmed creature for the duration of this effect. Each time the charmed creature takes damage it can repeat the saving throw, ending the effect on a success. The effect also ends if the siren uses Song of Desire against another creature.

Pressure Crash (Recharge 4-6). Each creature in a 10-foot- radius sphere centered on a point within 60 feet of the siren must make a DC 16 Constitution save. A creature takes 18 (4d8) thunder damage and 18 (4d8) psychic damage on a failed save or half as much damage on a successful one.

The siren can take 2 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. The siren regains spent legendary actions at the start of its turn.

Move. The siren moves up to half her speed without provoking opportunity attacks.
Detect. The siren makes a Wisdom (Perception) check.
Claws. The siren attacks with her claws.
Devour (2 Actions). The siren manifests lashing tentacles in a 15-foot cone originating from her. Each creature in that area must succeed on a DC 16 Dexterity saving throw or take 12 (5d4) piercing damage.