Volt Charge

You brandish the weapon used to cast this spell. Your blade crackles with lightning, dealing an additional 1d6 lighting damage on each weapon attack for a number of rounds equal to your proficiency bonus The additional damage is decided at the time of casting, not on every subsequent attack.

At Higher Levels. When you reach certain levels, the damage of this spell increases by 1d6, becoming 2d6 at 5th level, 3d6 at 11th level, and 4d6 at 20th level.