You launch a swirling ray of disruptive energy at a creature within range. Make a ranged spell attack. On a hit, the creature takes 6d8 necrotic damage and its maximum hit points are reduced by an equal amount. This reduction lasts until the creature finishes a short or long rest, or until it receives the benefit of a [greater restoration](https://api.open5e.com/spells/greater-restoration) spell or comparable magic. This spell has no effect on constructs or undead.