Telepathic Bond. Ararissa ignores the range restriction on its telepathy when communicating with a creature it has charmed. The two don't even need to be on the same plane of existence.
Shapechanger. Ararissa can use her action to polymorph into a Small or Medium humanoid, or back into her true form. Without wings, Ararissa loses her flying speed. Other than her size and speed, her statistics are the same in each form. Any equipment she is wearing or carrying isn't transformed. She reverts to its true form if she dies.
Innate Spellcasting. Ararissa can innately cast following spells. Charisma is her spellcasting ability and she's 10th level spellcaster.
At Will: Vicious Mockery, Prestidigitation, Thunderwave (3rd level)
3/day (each): Heat Metal (4th level), Message, Healing Word (2nd level)
1/day (each): Greater Invisibility, Mass Healing Word (5th level)
Multiattack. Ararissa makes three weapon attacks, either with her scimitar or her claws.
Scimitar. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 5) slashing damage plus 9 (2d8) thunder damage.
Claw (Fiend Form Only). Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 14 (3d6 + 5) slashing damage plus 9 (2d8) thunder damage.
Mesmerizing Dance. One humanoid Ararissa can see within 30 feet of it must succeed on a DC 17 Wisdom saving throw or be magically charmed for 1 day. The charmed target obeys Ararissa's verbal or telepathic commands. If the target suffers any harm or receives a suicidal command, it can repeat the saving throw, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to Ararissa's Charm for the next 24 hours.
Ararissa can have only one target charmed at a time. If she charms another, the effect on the previous target ends.
Ararissa can use this ability only when she's not [condition]restrained[Icondition].
Draining Kiss. Ararissa kisses a creature charmed by her or a willing creature. The target must make a DC 15 Constitution saving throw against this magic, taking 32 (5d10 + 5) psychic damage on a failed save, or half as much damage on a successful one. The target's hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.
Etherealness. Ararissa magically enters the Ethereal Plane from the Material Plane, or vice versa.