Ancient Orange Dragon

Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Rage. All of the dragon's attacks deal extra damage equal to the amount of health the dragon is missing from its maximum divided by 10

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:  +17 to hit, reach 15 ft., one target. Hit: 26 (3d10 + 10) piercing damage. 

Claw. Melee Weapon Attack: +17 to hit, reach 10 ft., one target. Hit: 22 (3d6+10) slashing damage.

Tail. Melee Weapon Attack: +17 to hit, reach 20 ft., one target. Hit: 23 (3d8+10)

Frightful Presence. Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 16 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

The dragon can 3 legendary actions, choosing from the options below. Only one legendary action 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 turns.

Tail Attack. The dragon makes a tail attack.

Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 15 feet of dragon must succeed on a DC 25 Dexterity saving throw or take 22 (3d6+10) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.