Multiattack

The slow storm makes three Slam attacks or four Lightning Bolt attacks. If two Slam attacks hit one creature, the target must succeed on a DC 18 Constitution saving throw or be wracked with pain for 1 minute. While the target is wracked with pain, minute bits of electricity dance within its body, and the target takes 4 (1d8) lightning damage for every 5 feet it moves. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Slam

Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 21 (3d10 + 5) bludgeoning damage plus 9 (2d8) lightning damage.

Lightning Bolt

Ranged Spell Attack: +9 to hit, range 120 ft., one target. Hit: 22 (4d8 + 4) lightning damage.

Static Shock (Recharge 5-6)

The slow storm releases built-up electricity in a 60-foot cone. Each creature in the area must make a DC 18 Constitution saving throw, taking 54 (12d8) lightning damage on a failed save, or half as much damage on a successful one. A creature that fails this saving throw by 5 or more is also stunned for 1 minute. A stunned creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.