Cora's Shocking Flames

The Caster summons a ball of crackling blue energy in their hand, and can throw it up to 30 feet. Upon landing, it makes a 10 ft by 10 ft square of racing electrical energy across the ground, with the occasional arcing bolts. Any creatures that move inside of the space must make a DeX saving throw. On a failed save, they take 6d6+10 lightning damage, and are incapacitated. On a successful save, they take half damage, and are not incapacitated.