Tempest in a Teapot

You create a 20-foot-radius sphere of dark and nebulous fog punctuated by arcs of lightning pours forth from your teapot and coalesces at a point within range. The fog spreads around corners. It lasts for the duration or until strong wind disperses the fog, ending the spell. Its area is heavily obscured.

When a creature enters the spell's area for the first time on a turn or starts its turn there, that creature must make a Constitution saving throw. The creature takes 5d8 lightning damage on a failed save, or half as much damage on a successful one.  They also become soaked in water and uncomfortable.

The fog moves 10 feet away from you at the start of each of your turns, rolling along the surface of the ground. The vapors, being heavier than air, sink to the lowest level of the land, even pouring down openings.

At Higher Levels. More powerful castings of this spell make the storm more intense.  When you cast this spell using a spell slot of 6th level or higher, 1d8 of thunder damage is added for each slot level above 5th.