You vomit atomic radiation which sits in an area and rapidly deteriorates everything in its vicinity. A 20-foot-radius Sphere of Darkness appears, centered on a point with range and lasting for the duration. The Sphere is Difficult Terrain, and it is filled with unbelievable levels of radiation, which can be felt up to 30 feet away. No light, magical or otherwise, can illuminate the area, and creatures fully within it have the Blinded condition.
Any creature that starts its turn in the area takes 3d6 Acid damage. Any creature that ends its turn there must succeed on a Dexterity saving throw or take 3d6 Acid damage from otherworldly tentacles.
Using a Higher-Level Spell Slot. The starting damage or saving throw damage (your choice) increases by 1d6 for each spell slot level above 4.
* - (a nugget of uranium)
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