Acrid Burst

A creature of your choice within range is drenched by corrosive liquid, which melts through its defenses. The target must make a dexterity saving throw. On a failed save, the target takes 10d4 acid damage. After they take this damage, roll an additional d4. The target's Armor Class is decreased by the number rolled, plus one. This reduction lasts for the same number of rounds as the number rolled plus one, or until concentration is broken. On a successful save the target takes half as much damage, and their Armor Class is not decreased.

At Higher Levels.When you cast this spell using a spell slot of 5th level or higher, the damage increases by 2d4 for each slot level above 4th