Ag'Thall the Broken

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

Magic Resistance. Ag'Thall has advantage on saving throws against spells and other magical effects.

Aura of Despair. Any creature that starts its turn within 40 feet of the Ag'Thall must succeed on a DC 18 Constitution saving throw or become frightened . Ag'Thall has advantage on attack rolls against feared creatures. Undead and Constructs are immune to this aura.

Innate Spellcasting (Psionics). Ag'Thall is a 16th-level spellcaster. Its innate spellcasting ability is Charisma (spell save DC 18; +10 to hit with spell attacks). It can innately cast the following spells, requiring no components:

At will: Chill Touch, Frostbite,Mage Hand, Message, Ray of Frost

1st level (4 slots):Command, Dissonant Whispers, Hideous Laughter, Inflict Wounds, Shield

2nd level (4 slots):Crown of Madness, Detect Thoughts, Suggestion

3rd level (4 slots):Counterspell, Hunger of Hadar, Remove Curse

4th level (3 slots):Arcane Eye, Black Tentacles, Phantasmal Killer

5th level (3 slots):Synaptic Static, Wall of Force

6th level (2 slots):Mass Suggestion, Soul Cage

7th level (1 slots):Crown of Stars, Forcecage

8th level (1 slots): Feeblemind, Maddening Darkness

Multiattack. Ag'Thall can attack twice with Deific Grasp,Tentacle Slam, or use Discarded if available.

Deific Grasp: Melee Weapon Attack: +11 to hit, reach 40 ft., one target. Hit: 13 (2d8+4 ) bludgeoning damage plus 18 (4d6+4) psychic damage. If the target is a Large or smaller creature, it must succeed on a DC 18 Strength saving throw or be grappled by Ag'Thall.

Discarded. Ag"Thall throws any creature that it has in its grasp 60 ft, in any direction. At the end of its trajectory the creature takes (1d4) force damage per every 10 ft thrown.

Tentacle Slam. Ag'Thall slams one of his tentacles in a straight line that's 60 ft long, and 10 ft wide. All creatures in the area must succeed on DC 16 or take 18 (4d8 ) bludgeoning damage plus 10 (2d6+4) psychic damage and be knocked prone by Ag'Thall on a failed save, or half as much damage on a successful save.

Visions of terror (2/Day). Ag'Thall sends horrific visions to all frightened creatures within 300 ft of it, creatures that witness the visions take 30(8d6) psychic damage on a fail DC 17 Wisdom saving throw, or half as much on success.