Aggressive. As a bonus action, the dragon can move up to its speed toward a hostile creature that it can see.

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

Innate Spellcasting. The dragon's spellcasting ability is Charisma (spell save DC 14). The deva can innately cast the following spells, requiring only verbal components:

5/day each: control flames, gust, thaumaturgy

1/day: hunter's mark

Multiattack. The dragon makes three attacks. One with its bite and two with its claws.

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) piercing damage plus 3 (1d6) fire damage.

Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 11 (1d12 + 5) slashing damage.

Tail. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) bludgeoning damage.

Fire Breath (Recharge 5–6). The dragon exhales a stream of fire in a 55-foot long, 10-foot wide line. Each creature in that area must make a DC 17 Dexterity saving throw, taking 35 (10d6) fire damage on a failed save, or half as much damage on a successful one.

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.

Melee Attack. The dragon makes a tail or claw attack.