Surface Discharge

You choose a surface that you can see withing 30ft from you. A small magic circle carved into the surface will appear at the spot you chose from which lightning from a terrible storm is summoned from. The magic circle will remain for two turns as long as the caster keeps concentrating. On the turn that the magic circle appears it activates and opens a small one-way rift from which a large lightning bolt will shoot out at a single creature. On the turn after the circle was summoned the caster can choose to activate the same circle again. If activated a second time the rift will open again and discharge a larger but weaker amount of electricity after which the magic circle will dissapear.

The creature closest to the magic circle within 10ft takes 3d4 lightning damage on the turn the circle appears. If more than one creature is equally close then the lightning will hit one of the closest at random. The caster can use a bonus action on their following turn to activate the circle a second time before it disapears. The second time the magic circle activates it deals 1d6 lightning damage to all creatures within a 15 foot radius.

If a creature is drenched in water they will have to make a constitution saving throw, on a failed save they will take an extra 1d6 Lightning damage from the circles lightning, If the creature succeed on their saving throw they take the normal damage instead.

The spell ends after the casters second turn or if they lose concentration.

At Higher Levels: The damage increases by 2d4 on the first turn for each slot level above 2nd. The damage increases by 1d6 on the second turn for each slot level above 2nd.