Astral Storm

The caster calls upon the Astral forces from the Astral Plane to rain destruction down upon the land. All creatures and objects in the spell's area take 10d6 points of fire, acid, or lightning damage (caster's choice). If the the caster is not a Deity or creature of similar power, they themself also take half the damage, as no mortal can channel the Astral powers unharmed.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 3d6 for each slot level above 3rd.