Darwin’s Horrid Acid Splash

You draw the moisture from every creature in a 30-foot cube centered on a point you choose within range, convert it into acid and splash it back on the creatures. Each creature in that area must make a Dexterity saving throw. Elementals and dragons aren’t affected, and beasts and constructs make this saving throw with disadvantage. A creature takes 10d8 necrotic damage on a failed save, or half as much damage on a successful one.