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

Chaotic Form. The dragon has a chaotic cloak of arcane energy around it, causing attack rolls against it to have disadvantage. If it is hit by an attack, this trait is disrupted until the end of its next turn. This trait is also disrupted while the dragon is incapacitated or has a speed of 0.

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

Chaotic Form. The dragon has a chaotic cloak of arcane energy around it, causing attack rolls against it to have disadvantage. If it is hit by an attack, this trait is disrupted until the end of its next turn. This trait is also disrupted while the dragon is incapacitated or has a speed of 0.

Actions

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: 21 (2d10+10) piercing damage plus 14 (4d6) force damage.

Claw. Melee Weapon Attack: +17 to hit, reach 10 ft., one target. Hit: 17 (2d6+10) slashing damage.

Tail. Melee Weapon Attack: +17 to hit, reach 20 ft., one target. Hit: 19 (2d8+10) bludgeoning damage.

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 21 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.

Force Breath (Recharge 5-6). The dragon exhales a blast of arcane force in a 120-foot line that is 10 feet wide. Each creature in that line must make a DC 24 Dexterity saving throw, taking 108 (24d8) force damage on a failed save, or half as much damage on a successful one.

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: 21 ([2d10+10]) piercing damage plus 14 ([4d6]) force damage.

Claw. Melee Weapon Attack: [+17] to hit, reach 10 ft., one target. Hit: 17 ([2d6+10]) slashing damage.

Tail. Melee Weapon Attack: [+17] to hit, reach 20 ft., one target. Hit: 19 ([2d8+10]) bludgeoning damage.

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 21 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.

Force Breath (Recharge 5-6). The dragon exhales a blast of arcane force in a 120-foot line that is 10 feet wide. Each creature in that line must make a DC 24 Dexterity saving throw, taking 108 ([24d8]) force damage on a failed save, or half as much damage on a successful one.