Aspect of Bahamut

Gargantuan Dragon (Metallic), Lawful Good

STR
30 (+10)
DEX
18 (+4)
CON
29 (+9)
INT
25 (+7)
WIS
28 (+9)
CHA
30 (+10)
Platinum Brilliance (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 500 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 Bahamut after his Platinum Brilliance activates.

Legendary Resistance (5/Day).

If the aspect fails a saving throw, he can choose to succeed instead.

Actions

Multiattack.

The aspect makes one Bite attack, one Claw attack, 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) force 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:

  • Exalting Breath.

    The aspect exhales the restoring winds of Mount Celestia in a 300-foot cone. Each creature in that area of the aspect's choice regains 71 (13d10) hit points, and each creature in that area of the aspect's choice that has been dead for no longer than 1 hour is restored to life with all its hit points.

  • Platinum Breath.

    The aspect exhales radiant platinum flames in a 300-foot cone. Each creature in that area must make a DC 26 Dexterity saving throw, taking 66 (12d10) radiant damage on a failed save, or half as much damage on a successful one.

Bonus Actions

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.

Legendary Actions

Legendary Action Uses: 3. Immediately after another creature's turn, this creature can expend a use to take one of the following actions; it regains all expended uses at the start of each of its turns.

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.

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Aspect of Bahamut

Source: Fizban's Treasury of Dragons, p. 165 - Licenses and attribution