Multiattack

The dragon uses its Frightful Presence. It then makes one Bite attack and two Claw attacks.

Bite

_Melee Weapon Attack:_ +15 to hit, reach 15 ft., one target. _Hit:_ 20 (2d10+9) piercing damage plus 11 (2d10) lightning damage.

Claw

_Melee Weapon Attack:_ +15 to hit, reach 10 ft., one target. _Hit:_ 16 (2d6+9) slashing damage.

Tail

_Melee Weapon Attack:_ +15 to hit, reach 20 ft., one target. _Hit:_ 18 (2d8+9) 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 19 WIS save or be frightened for 1 minute. A creature can repeat the save at the end of each of its turns, ending the effect on itself on a success. If a creature's save is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

Lightning Breath (Recharge 5-6)

The dragon exhales lightning in a 120-foot line that is 10 feet wide. Each creature in that line must make a DC 22 DEX save, taking 99 (18d10) lightning damage on a failed save, or half as much damage on a successful one.