As two actions, you draw the moisture from every creature in a sphere centered on a point within 20 meters. Each creature in that area must make a Fortitude saving throw. Constructs and undead aren’t affected, and plants and water elementals make this saving throw with disadvantage. A creature takes 6d8 necrotic damage on a failed save, or half as much damage on a successful one.
You can increase the damage by 2d8 for each additional mana or psi expended.