Voltaic Discharge

You unleash a blast of volatile electricity in a 30-foot radius centered on you. Any creature within this radius must make a Constitution saving throw or take 6d8 lightning damage, taking half damage on a successful save. Creatures wearing metal armor have disadvantage on this saving throw.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the lightning damage increases by 1d8 for each slot level above 4th.