Dessicate

You remove moisture from a creature or object you touch. If the target is a creature, it must make a Constitution saving throw. Constructs and undead aren’t affected, and plants and water elementals make this saving throw with disadvantage. On a failed save, a creature takes 6d8 necrotic damage and its hit point maximum is reduced by that amount. This reduction lasts until the creature finishes a long rest.

If the target is a corpse, you extend the time limit on raising the target from the dead. The extension is either 10 minutes or double the limit, whichever is greater.