Exhausting Bolt

A beam of energy lances out toward a creature within range, forming a sustained arc between you and the target, sapping them of their energy. Make a ranged spell attack against that creature. On a hit, the target takes 1 level of exhaustion, and on each of your turns for the duration, you can use your action to deal another level of exhaustion to the target automatically. The spell ends if you use your action to do anything else. The spell also ends if the target is ever outside the spell’s range or if it has total cover from you. However, if the target takes cover behind another creature, then the spell switches to targeting that creature.