You call upon the heavens to grant your power in a booming voice that all creatures within a 240 ft. radius can hear. A storm cloud appears in the shape of a cylinder that is 20 feet tall with a 120-foot radius, centered on a point you can see within range directly above you. 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, point at a location 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 Dexterity saving throw. A creature takes 10d10 lightning damage and 8d8 radiant damage on a failed save and is paralyzed until the end of their next turn, 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 1d10 and and 1d8.
At Higher Levels. When you cast this spell using a spell slot of 8th or higher level, the damage increases by 1d10 1d8 for each slot level above 7th.
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