Mordenkainen's Lost Notebook

Scintillating Sphere

3-level Evocation

A small electrically charged sphere appears in the air in front of you and then streaks out to a location you can see within range. When the sphere reaches the location, it bursts with electricity in a 20-foot radius. Each creature within the area must make a Dexterity saving throw or take 5d10 lightning damage, or half as much on a successful save. Creatures wearing metal armor have disadvantage on the save.
At higher levels: At higher levels: When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 for every slot level above 3rd.