Acid Lash (EFA - A)

You create a 10-foot long, glowing line of magical force which you can use as a whip. You are proficient in the whip, and use your spell attack modifier to attack.

On a hit, it does 2d10 acid damage. If it does at least 15 points of damage, and if the target is wearing armor, the armor’s AC bonus is permanently reduced by 1. If it is reduced to AC 10, the armor is destroyed.