Beguiler

Pscoinic Scream. When the beguiler dies, it explodes with a mind-shattering scream, and each creature within 30 feet of it must make a DC 20 Wisdom saving throw, taking 70 (20d6) psychic damage on a failed save, or half as much damage on a successful one. The explosion destroys objects in that area that aren’t being worn or carried.

Beguiling Aura. At the start of each of the beguiler's turns, each creature within 5 feet of it takes 10 (3d6) psychic damage. A creature that touches the beguiler or hits it with a melee attack while within 5 feet of it takes 10 (3d6) force damage.

Multiattack. The beguiler makes two attacks with its tentacle but may replace one of these attacks with a spell.

Tentacle. Melee Weapon Attack: +12 to hit, reach of 10 ft., one target. Hit: 19 (3d8 + 6) Bludgeoning damage plus 13 (3d8) psychic damage.

Bewildering Blast. Each creature within 20 ft. of the beguiler must make a DC 22 Strength saving throw or take 24 (2d10 + 8) Force damage and be pushed back 20 ft. On a successful save, a target takes half as much damage and is not moved.

Spellcasting. The beguiler casts one of the following spells, requiring no material components and using Wisdom as the spellcasting ability (spell save DC 22):

At will: command, dissonant whispers, sleep, tasha's hideous laughter, enthrall, charm monster, mental shunt

3/day each: dominate person, fear, synaptic snap, telekinesis, psychokinesis 

2/day each: hold person, confusion, phantasmal killer, dream, mass suggestion, antipathy/sympathy, beguil

1/day each: mirror image, power word: pain, psychic scream

Flicker. The beguiler teleports up to 30 feet to an unoccupied space that it can see.

Tentacle Grasp. Melee Weapon Attack: +12 to hit, reach of 10 ft., one target. Hit: 15 (2d8 + 6) Bludgeoning damage plus 4 (1d8) Force damage, and the target becomes grappled.