Acid ball

As an action pick a point in a 60 foot range a small beard flies from your finger or arcane focus. After reaching that point it explodes into a bubble of acid with a 20 foot radius. Any creature in that bubble must succeed on a dexterity saving throw. On a save the creature takes half damage. On a failed save the creature takes 8d6 damage and is incapacitated until the start of your next turn