monster

Aspect of Tiamat

CR 30

Gargantuan Dragon (chromatic), Chaotic Evil

Reveal Stat Block

Armor Class

23 (natural armor)

Hit Points

574 (28d20 + 280)

Speed

60 ft., fly 120 ft., swim 60 ft., burrow 60 ft.

str

+10

dex

con

+10

int

wis

cha

Traits

Chromatic Wrath (Recharges after a Short or Long Rest).If the aspect would be reduced to 0 hit points, her current hit point total instead resets to 500 hit points, she recharges her Chromatic Flames, and she 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 Tiamat after her Chromatic Wrath activates.

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

Actions

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

Bite.mw 19 to hit, reach 20 ft., one target. ({@damage 2d12 + 10) piercing damage plus 19 (3d12) force damage.

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

Tail.mw 19 to hit, reach 15 ft., one target. ({@damage 2d12 + 10) bludgeoning damage. If the target is a creature, it must succeed on a 27 Strength saving throw or be knocked prone.

Chromatic Flames 5.The aspect exhales multicolored flames in a 300-foot cone. Each creature in that area must make a 27 Dexterity saving throw. On a failed save, the creature takes 71 (11d12) damage of a type of the aspect's choosing: acid, cold, fire, lightning, or poison. On a successful save, the creature takes half as much damage.

Legendary Actions.The creature can take 3 legendary actions...

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 27 Wisdom saving throw or become frightened of the aspect until the end of its next turn.

Aspect of Tiamat

The five-headed progenitor of chromatic dragons, Tiamat embodies the vices of evil dragons. Since the destruction of the First World, she has dwelled in the Nine Hells—some say by choice. But others claim that she is imprisoned there to punish her for the evils she perpetrated when the gods sought to colonize the First World with their followers.

Mortals who hunger for power and wealth often swear fealty to Tiamat in pursuit of those goals. Many of her followers have attempted to break her out of Avernus—and failed—but even while she remains in the Nine Hells, Tiamat can send her aspect to manifest in the Material Plane. A follower with enough power and anger, and with a hoard worthy of ancient dragons, can sacrifice it all to unleash the wrath of the dragon queen on a world.

The aspect of Tiamat has the body of a titanic dragon with five heads, each the shape and hue of a different chromatic dragon. Each head might speak separately and have different mannerisms, but they are all Tiamat. Once unleashed, the aspect of Tiamat rampages across the world, acquiring any treasure she can find and destroying any creature that dares to cross her path.