Ariaspira (greater succubus)

Telepathic Bond. The fiend 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. The fiend can use its action to polymorph into a Small or Medium humanoid, or back into its true form. Without wings, the fiend loses its flying speed. Other than its size and speed, its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

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

Agonizing blast. Ariaspira adds their charisma modifier to the damage of their eldritch blast

Spellcasting. is a 20th-level spellcaster. It's spellcasting ability is charisma (spell save DC 23, +15 to hit with spell attacks). She has the following spells prepared

Cantrips.  eldritch blast, prestidigitation, minor illusion, thaumaturgy.

1st level (4 slots) charm person, cure wounds, command, healing word, protection from evil and good, heroism, silvery barbs.

2nd level (3 slots) suggestion, invisibility, enthrall, calm emotions, hold person, pacify person.

3rd level (3 slots) fast friends, hypnotic pattern, incite greed, counterspell, motivational speech, mass healing word

4th level (3 slots) death ward, charm monster, dimension door, locate creature, pacify monster.

5th level (3 slots) modify memory, dominate person, telekinesis, dream, geas, synaptic static.

6th level (2 slots) mass suggestion, word of recall, otto's irresistible dance.

7th level (2 slots) divine word, forcecage.

8th level (1 slot) antipathy/sympathy, dominate monster.

9th level (1 slot) gate, shapechange

 Ariaspira can make two attacks then use Charm or cast a 5th level or lower spell  with a casting time of a action.

Claw (Fiend Form Only). Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 9 (1d6 + 6) slashing damage and the target must succeed on a DC 23 wisdom saving throw or be affected by the command spell.

Whip. Melee Weapon Attack: +13 to hit, reach 30 ft., one target. Hit: 13 (2d6 + 6) slashing damage plus 7 (2d6) fire damage and 7 (2d6) psychic damage.

Charm. One humanoid the fiend can see within 30 feet of it must succeed on a DC 23 Wisdom saving throw or be magically charmed for 1 day. The charmed target obeys the fiend'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 this fiend's Charm for the next 24 hours.

The fiend can have only one target charmed at a time. If it charms another, the effect on the previous target ends.

Draining Kiss. Ariaspira kisses a creature charmed by it or a willing creature. The target must make a DC 23 Constitution saving throw against this magic, taking 63 (10d10 + 8) 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 and Ariaspira gains that many temporary hit points. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Etherealness. The fiend magically enters the Ethereal Plane from the Material Plane, or vice versa.

• Move (1 action): The succubus moves up to their movement speed

• Attack (1 action): The succubus uses its Claw or Whip attack

• Draining Kiss (2 actions): The succubus uses its draining kiss ability. 

• Spellcasting (3 actions): The succubus cast a spell with a casting time of a action or bonus action.