Bealza

Innate Spellcasting. Bealza's innate spellcasting ability is Charisma {spell save DC 22). She can innately cast the following spells, requiring no material components:  

At will: alter self {can become Medium when changing her appearance), shape water, animate dead, detect magic, geas, invisibility

1/day: dispel magic, blade barrier

Spellcasting. Bealza is a 14th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 18, +16 to hit with sell attacks). Bealza has the following wizard spells prepared:

Cantrips(at will): mage hand, mending, firebolt

1st level (4 slots): magic missile, shield, Tasha's hideous laughter, witch bolt

2nd level (3 slots): blindness/deafness, detect thoughts, flaming sphere, scorching ray

3rd level (3 slots): counterspell, fear, lightning, sending, 

4th level (3 slots): banishment, blight, phantasmal killer. polymorph

5th level (2 slots): dominate person, modify memory, scrying, telekinesis

6th level (1 slot): chain lightning, disintegrate

7th level (1 slot): plane shift, forcecage

Magical Resistance. Bealza has advantage on saving throws against spells and other magical effects

Magical Weapons. Bealza's weapon attacks are magical.

Regeneration. Bealza regains 20 hit points at the start of her turn. If she takes radiant damage, this trait doesn't function at the start of her next turn. Bealza dies only if she starts her turn with 0 hit points and doesn't regenerate. 

Multiattack. Bealza makes three tentacle attacks.

Change Shape: Bealza magically polymorphs into a humaniod or beast that has a challenge reating no higher than her own, or back to her true form. Any equipment it is wearing or carrying is absorbed or borne by the new form (her choice). In the new form, Bealza retains its alignment, hit points, Hit Dice, ability to speak, proficiencies, Legenndary Resistance, and Intelligence, Wisdom, and Charisma scores, as well as this action. All other statistics are otherwise replaced by those of the new form, except class features or legendary actions of the form.

Talon. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 20 (2d12 + 7) slashing damage.

Tentacle. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 18 (3d6 + 7) bludgeoning damage plus 11 (2dl0) necrotic damage.

Teleport. Bealza magically teleports, along with any equipment she is wearing and carrying, up to 120 feet to an unoccupied space she can see.

Bealza 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. Bealza regains spent legendary actions at the start of her turn.

Destroy Sanity (Costs 2 actions). Creatures that can see Bealza must make a DC 20 Wisdom saving throw. On a failure, a creature takes 12 physic damage and must roll a d4 to determine its action for its next turn. On a success, the creature takes 6 physic damage.

1: Victim drops any weapons it is carrying and use its movement to move towards Bealza.

2: Victim makes a weapon attack on the nearest creature. If no creatures are in range, the victim uses its full movement towards the closest creature before attacking.

3. Victim uses no actions on its turn.

4. If the victim is a spellcaster it spends a 1st level spell slot, if not the victim makes an unarmed strike against itself.

Talon. Bealza uses her Talon attack.

Teleport. Bealza uses her Teleport action.