You Summon deadly storm clouds.

The Spell fails if you can't see a point in the air where the storm cloud could appear (for example, if you are in a room that can't accommodate the cloud).

When you cast the Spell, choose a point you can see under the cloud. A bolt of Lightning flashes down from the cloud to that point. Each creature within 5 feet of that point must make a Fortitude. A creature takes 3d10 Lightning damage on a failed Contesting Roll, or half as much damage on a successful one. On each of your Turns until the Spell ends, you can use your action to call down Lightning in this way again, targeting the same point or a different one.

If you are outdoors in stormy conditions when you cast this Spell, the Spell gives you control over the existing storm instead of creating a new one. Under such conditions, the spell's damage increases by d10.

With a voice that resonates like distant thunder, you summon the storm. Above, dark clouds obey your command, swirling ominously. Ozone and rain scent the air, every hair standing on end. Energy surges through you, roaring in your ears and tingling in your teeth and eyes. With tempestuous fury, you unleash it, directing bolts of blue-white lightning. Crackling energy fills the air as lightning strikes repeatedly, debris swirling in the aftermath.

I Cast Call Lightning
Thunder and wind escape my lips, birthing a brooding cloud. It kindles within, racing light. As my hand orchestrates, youthful electricity gathers and strikes down.