Acidic Deluge

You conjure a torrent of corrosive acid that washes over a 30-foot cube within range. Each creature in that area must make a Dexterity saving throw. On a failed save, a creature takes 12d8 acid damage, or half as much damage on a successful one. 

A creature that fails the saving throw also suffers from intense acid burns, causing an additional 1d8 acid damage at the start of its next turn. The additional damage persists until the creature receives healing or a successful Constitution saving throw.

The acid damage from this spell is not affected by resistance or immunities.