Multiattack

The storm lord makes two slam attacks or two lightning bolt attacks.

Slam

Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 29 (7d6 + 5) bludgeoning damage.

Lightning Bolt

Ranged Spell Attack: +9 to hit, range 60 ft., one target. Hit: 31 (7d8) lightning damage.

Thunder Clap (Recharge 5-6)

The storm lord creates a peal of ear-splitting thunder. Each creature within 30 feet of the storm lord must make a DC 17 Constitution saving throw. On a failure, a target takes 54 (12d8) thunder damage and is deafened. On a success, a target takes half the damage but isn't deafened. The deafness lasts until it is lifted by the lesser restoration spell or similar magic.