Rrhondan the Primeval

Rrhondan, Gargantuan Dragon (Primeval), Lawful Neutral
--
AC: 30 (natural armour)
Hit Points: 6751 (75d20 + 3000)
Speed: 80ft, climb 80ft, fly 160ft
--
STR 30 (+10); DEX 15 (+2); CON 30 (+10); INT 20 (+5); WIS 17 (+3); CHA 25 (+6)
--
Saving Throws:
Skills: Perception; Nature; Survival; Stealth
Senses: 240ft Blindsight, 500ft Darkvision, Passive Perception Fuck You
Damage Immunities: Fire, Cold, Bludgeoning/Piercing/Slashing from Non-magical weapons
Resistances: Thunder, Lightning, Necrotic, Radiant, Poison, Acid, Bludgeoning/Piercing/Slashing from Non-magical weapons
Languages: Understands all languages, speaks Primordial (All Four Dialects), Qualith, Celestial, Infernal, Abyssal, Draconic, and Giant.
Challenge: 30 (Many)
--
Legendary Resistance (5/Day): If Rrhondan fails a save, he can choose to succeed instead.
--
ACTIONS
Note: All of Rrhondan's attacks are considered magical and silvered for the purposes of resistances.

Awesome Presence
Each creature that is within 240ft of Rrhondan and is aware of its presence must make a DC26 Wisdom saving throw or become Stunned & Frightened for one minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to Rrhondan's Awesome Presence for the next 24 hours.

Bite
Melee Weapon Attack, +20 to Hit, reach 25ft, one target.
On hit: 2d12+20 piercing damage, plus 6d6 radiant damage.

Claw
Melee Weapon Attack, +20 to hit, reach 15ft, one target.
On Hit: 4d8+12 slashing damage.

Tail Attack
Melee Weapon Attack, +20 to Hit, reach 50ft, one target.
On Hit: 4d10+16 bludgeoning damage + DC20 Con save or be paralyzed for one minute.
--
SPELLS

Rrhondan is a 20th Level Psionic, and can cast the following spells innately, with no material components required.

Level 6: Blade Barrier, Chain Lightning, Contingency, Forbiddance, Globe of Invulnerability, Guards and Wards, Harm, Heal, Mass Suggestion, Move Earth, Sunbeam, True Seeing
Level 7: Divine Word, Etherealness, Firestorm, Force Cage, Mirage Arcane, Plane Shift, Prismatic Spray, Project Image, Regenerate, Resurrection, Reverse Gravity, Sequester, Simulacrum, Symbol, Teleport
Level 8: Antimagic Field, Clone, Control Weather, Demiplane, Dominate Monster, Earthquake, Feeblemind, Glibness, Holy Aura, Incendiary Cloud, Maze, Mind Blank, Power Word Stun, Sunburst
Level 9: Foresight, Gate, Imprisonment, Mass Heal, Meteor Swarm, Power Word Kill, Storm of Vengeance, Time Stop, True Resurrection, Weird, Wish