Adult Lightning Dragon

Living Storm

Electricity crackles around the dragon in a 15-foot radius. A creature that starts its turn within the aura takes 7 (2d6) lightning damage.

Thunderous Presence

Creatures of the dragon’s choice within 30 feet have disadvantage on saving throws against being frightened.

Multiattack

The dragon makes three attacks: one with its Bite and two with its Claws.

Bite

Melee Weapon Attack: +14 to hit, reach 15 ft., one target.
Hit: 22 (3d8 + 8) piercing damage plus 13 (3d8) lightning damage.

Claw

Melee Weapon Attack: +14 to hit, reach 10 ft., one target.
Hit: 17 (2d8 + 8) slashing damage plus 7 (2d6) lightning damage.

Tail Strike

Melee Weapon Attack: +14 to hit, reach 20 ft., one target.
Hit: 20 (2d10 + 8) bludgeoning damage plus 4 (1d8) thunder damage.

The target must succeed on a DC 22 Strength saving throw or be pushed 15 feet.

Lightning Breath (Recharge 5–6)

The dragon exhales a devastating bolt of concentrated lightning in a 120-foot-long, 10-foot-wide line.

Each creature in the line must make a DC 21 Dexterity saving throw, taking 72 (16d8) lightning damage on a failed save, or half as much on a successful save.

Creatures wearing metal armor have disadvantage on this saving throw.

Tempest Roar (Recharge 6)

The dragon unleashes a thunderous roar infused with storm magic.

Each creature of the dragon’s choice within 40 feet must make a DC 21 Constitution saving throw.

On a failed save, a creature takes 27 (6d8) thunder damage, becomes deafened for 1 minute, and is pushed 20 feet away. On a successful save, the creature takes half damage and isn’t pushed or deafened.

Chain Arc

When the dragon takes damage from a creature within 60 feet, it can release a bolt of electricity.

The triggering creature and up to two other creatures within 15 feet of it must make a DC 21 Dexterity saving throw, taking 14 (4d6) lightning damage on a failed save, or half as much on a success.