Undercharge/Overcharge

Undercharge - You throw an electric shock at a creature or object within range. Make a ranged spell attack against a target you can see within 60ft. On a hit, the target takes 1d6 Lightning Damage.The spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).

Overcharge - You let the electric charge build and grow before attacking. On the turn you cast Overcharge you spend your action charging the spell.. At the start of your next turn you make a DC 12 Constitution Saving Throw. On a success you use your action to release the spell making a ranged spell attack against a target you can see within 60ft. On a hit, the target takes 2d10 Lightning Damage. If you fail the save, the undercharged version of the spell hits you instead dealing 1d6 Lightning Damage, scaling as above. The spell's damage increase by 2d10 when you reach 5th level (4d10), 11th level (6d10), and 17th level (8d10).