Aspect of Jun Thur, King of Dragons

Celestial Rebirth (Recharges after a Short or Long Rest). If the aspect would be reduced to 0 hit points, his current hit point total instead resets to 600 hit points, he recharges his Breath Weapon, and he regains any expended uses of Legendary Resistance. Additionally, the aspect can now use the options in the “Mythic Actions” section for 1 hour. Award a party an additional 155,000 XP (310,000 XP total) for defeating the aspect of Jun Thur after his Celestial Rebirth activates.

Legendary Resistance (5/Day). If the aspect fails a saving throw, he can choose to succeed instead.

Magic Resistance. The aspect has advantage on saving throws against spells and other magical effects.

Thunderous Aura. Touching or hitting the aspect while within 5 ft. of it causes 10 thunder damage.

Multiattack. The aspect makes one Bite attack, two Claw attacks, and one Tail attack.

Bite. Melee Weapon Attack: +19 to hit, reach 20 ft., one target. Hit: 23 (2d12 + 10) piercing damage plus 22 (4d10) thunder damage.

Claw. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 21 (2d10 + 10) slashing damage. If the target is a Huge or smaller creature, it is grappled (escape DC 20) and is restrained until this grapple ends. The aspect can have only one creature grappled this way at a time.

Tail. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 23 (2d12 + 10) bludgeoning damage. If the target is a creature, it must succeed on a DC 27 Strength saving throw or be knocked prone.

Breath Weapon (Recharge 5–6). The aspect uses one of the following breath weapons:

Alluring Breath. The aspect exhales a booming shout in a  300-foot cone. Each creature in that area of the aspect’s breath must make a DC 26 Wisdom Saving throw. On a save fail, they become Charmed by the Aspect for 1 minute.

Celestial Storm Breath. The aspect exhales radiant lightning in a 300-foot line. Each creature in that area must make a DC 26 Dexterity saving throw, taking 88 (8d10) radiant damage plus (8d10) lightning damage on a save fail, and half as much on a save success.

Change Shape. The aspect magically transforms into any Humanoid or Beast, while retaining his game statistics (other than his size). This transformation ends if the aspect is reduced to 0 hit points or if he uses a bonus action to end it.

Thunderous Shield. (Recharge 5–6). When hit by an attack, the Aspect can spread thunderous energy around his body giving him a +7 to his AC.

The aspect 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. The aspect regains spent legendary actions at the start of his turn.

Attack. The aspect makes one Claw or Tail attack.

Furious Bite (Costs 2 Actions). The aspect makes one Bite attack. If the attack hits a creature, the target must succeed on a DC 27 Wisdom saving throw or become frightened of the aspect until the end of the target’s next turn.

If the aspect’s Celestial Rebirth trait has activated in the last hour, he can use the options below as legendary actions.

Storm Strike (Costs 2 Actions). The aspect manifests six bolts of Lightning. Each creature hit with a bolt must make a DC 26 dex save or take  (4d10) lightning damage plus 5 thunder damage.

Unhinged Breath (Costs 3 Actions). The aspect shakes his head during his Celestial storm breath and changes it from a line to a cone attack.