Aggaggaggagga

Cursed Telepathy. Aggaggaggaggaggagga can magically transmit messages and visions to any creature within 120 feet of it that can understand a language. Any hostile creature starting their turn within range must make a DC 17 Wisdom saving throw. On a failure, their head fills with nightmarish visions and messages and Aggagga can choose to either charm them or frighten them until the beginning of their next round. A creature that succeeds on their wisdom saving throw is immune to the nightmarish visions for 24 hours, hearing them still but suffering no negative effect.

Aggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggagga's Secret Nook. Inside the rotting undead dire wolverine's body is a tunnel leading into Aggaggagga's secret nook, a pocket dimension made of crayon's drawing, marvelous colors, twisted plants, blood and gore. The tunnel is made of flesh and is too small to allow in Large or larger creatures. Inside the secret nook, any hostile living creature takes 1d4 necrotic damage per turn. 

Legendary Resistance (3/Day). If Aggaggaggaggaggaggagga fails a saving throw, he can choose to succeed instead.

Spellcasting. Aggagga is a 12th-level spellcaster. His spellcasting ability is Charisma (spell save DC 17, +9 to hit with spell attacks). Aggaggaggaggaggaggaggaggagga has the following sorcerer spells prepared:

Cantrips (at will): acid splash, chill touch, control flames, minor illusion, prestidigitation, shocking grasp, 

1st level (4 slots): catapult, comprehend languages, detect magic, mage armor, ray of sickness, shield

2nd level (3 slots): darkness, hold person, mind spike

3rd level (3 slots): counterspell, dispel magic, fear, hypnotic pattern, sending

4th level (3 slots): blight, dimension door, polymorph

5th level (2 slots): dominate person, danse macabre, immolation

6th level (1 slot): disintegrate

Multiattack. Aggaggaggaggagga makes a claw attack and either uses one of its blast abilities or casts a spell

Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 6) slashing damage. If the target is Medium or smaller, they must make a DC 18 Strength saving throw, falling prone on a failure.

Necrotic Blast (Recharge 5-6). Aggaggagga releases a wave of flesh-rotting negative energy. Any creature in a 30 foot radius must make a DC 17 Wisdom saving throw. On a failure, they take 18 (4d8) points of necrotic damage and are frightened for 1d4 turns. On a success, they take half damage.

Mind Blast (Recharge 5-6). Aggaggaggaggaggaggaggagga releases a wave of mind-wracking psychic energy.Any creature in a 30 foot radius must make a DC 17 Wisdom saving throw. On a failure, they take 18 (4d8) points of psychic damage and are charmed for 1d4 turns. On a success, they take half damage.

Agga 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. Aggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggaggagga regains spent legendary actions at the start of its turn.

Cantrip. Aggaggaggaggaggagga casts a cantrip.

Claw. Aggaggaggaggaggaggaggaggaggaggaggagga makes a claw attack.

Blast (Costs 2 Actions). Aggagga uses one of his blast abilities.