Thordon's Superstorm

You create a bolt of lightning that soars up to the sky. where the bolt touched forms a dark cloud, with flickers of blue light coming from it. you can choose which  of these two effects happen. 

LIGHTNING: 1d6 bolts of lightning fly from the cloud in a straight line to targets of your choice within 600 feet of the cloud. a target must make a Dexterity saving throw. The target takes 10d8 lightning damage on a failed save, or half as much damage on a successful one. if the target is wearing metal armor or wielding a metal weapon, deal 2d8 more lightning damage, and chain up to one other creature within 30 ft, dealing 2d8 lightning.

WIND: a single tornado descends from the cloud, and touches the ground. All creatures within 200 ft make a dexterity or strength saving throw, on a success they take 5d12 force. On a failure they are knocked prone and picked up by the tornado taking 10d12 force damage + 1d12 per other creature currently in the tornado.