Dark Lightning

multiple thin bolts of corrupted lightning spring from your fingers. It passes through up to 9 creatures in range, seeking out each target that you choose.  Each target must make a dexterity saving throw, taking 10d10 lightning damage + 10d10 necrotic damage on a failed save, or half as much on a success. In addition, the target is stunned for one minute and if they fail their saving throw, or not stunned if they succeed. At the end of each of their subsequent turns, a stunned target can make a constitution saving throw to resist the effect. Any hit points lost to this spell cannot be regained through any means other than a long rest.