Temperature Aura. At the start of each of the dragon's turns, it deals 3 (1d6) fire damage to each creature within 5 ft of it. The dragon can also choose to turn off the aura for 1 round, after which it automatically restarts, automatically dealing 2 (1d4) fire or cold damage to each target within 10 ft of the dragon in the process.

Legendary Resistance (2/Day). If the dragon fails a saving throw, it can choose to succeed on

Multiattack. The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 14 (2d8 + 5) piercing damage plus 3 (1d6) fire damage.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 10 (1d10 + 5) slashing damage.

Tail. Melee Weapon Attack: +9 to hit, reach 15 ft., one target. Hit: 12 (2d6 + 5) bludgeoning damage.

Fireball. Ranged Weapon Attack: +4 to hit, range 20/60 ft., one target. Hit: 16 (3d10) fire damage.

Fire Breath (Recharge 5-6). The dragon exhales an burst of flame in a 55-foot cone or 60-foot, 10-feet wide line. Each creature in that area must make a DC 18 Constitution saving throw, taking 42 (12d6) fire damage on a failed save, or half as much damage on a successful one.

Havoc (Recharge 6). The dragon unleashes hidden arcane energies deep within it that makes it that for the next 4 rounds, whenever the dragon hits a creature with an attack, the dragon must make a DC 13 Strength saving throw. On a fail the dragon automatically takes 2 force damage and is stunned until 1 round has passed or until it takes damage or something comes to shake it awake before 1 round has passed. On a success, the dragon has advantage on all attack rolls and Strength and Constitution saving throws until the end of the spell duration. If the dragon succeeds on two of these saving throws in a row, all of its attacks deal an extra two die of damage and it has advantage on all attack rolls and Strength and Constitution saving throws until the end of the duration.

The dragon can take 2 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 dragon regains spent legendary actions at the start of its turn.

Detect. The dragon makes a Wisdom (Perception) check.

Tail Attack. The dragon makes a tail attack.