A storm cloud appears in the shape of a cylinder that is 10 feet tall with a 60-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, choose a point you can see under the cloud. You concentrate for 1 turn to summon 1d20 lightning bolts on a specific point. This activates the next turn you gain control after starting the concentration. Every creature within 10 feet of that point makes a Dexterity saving throw. A failed save makes them take 8d20 lightning damage, or half as much damage on a successful 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 1d20.
At Higher Levels. When you cast this spell using a spell slot of 8th or higher level, the damage increases by 1d20 for each slot level above 7th.
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