Trident's Obelisk of Lightning

You harness the power of lightning, taking on a divine form while striking nearby enemies with your bolts of lightning. When casting this spell, each creature within a 30 feet sphere centered on you of your choice must make a Dexterity saving throw or take 2d10 lightning damage. On failed save, they take half damage. 

During the duration of this spell, as a bonus action you can send a bolt of lightning to a creature you can see within 30 feet of you. Make a ranged spell attack, on a hit, you deal lightning damage equal to 3d6.

At Higher Levels. When you cast this spell spell slot of 5th level or higher, you increase the lightning damage by 1d10, 1d6, and increase the duration by 1 round for every slot above 4th level.