Legendary Resistance (1/Day). If the dragon fails a saving throw, it can choose to succeed instead.  

Multiattack. The dragon makes one bite attack, one attack with its talons, and one with its tail.

Bite. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 18 (3d6+3) piercing damage and 8 (1d8+3) fire damage.

Talons. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 18 (3d6+3) slashing damage.

Tail. Melee Weapon Attack: +8 to hit, reach 20 ft., one target. Hit: 23 (3d8+3) bludgeoning damage and the target must make a DC 16 Strength saving throw or be knocked prone.

Fire Breath (Recharge 5-6). The dragon exhales bright yellow-orange flames in a 40-foot cone. All creatures in that radius must make a DC 16 Dexterity saving throw, taking 43 (7d6) fire damage on a failed save, or half as much on a success.

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 Strike. The dragon makes a melee attack. If the attack hits, it deals 1 extra damage of the attack's main damage.

Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 10 feet of the dragon must succeed on a DC 17 Dexterity saving throw or take 14 (2d6+3) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.