Corrosive Spike

You launch a needle of acid at a creature or object within range aiming to compromise the integrity of their defenses. Make a ranged spell attack against the target. On a hit, the target takes 1d6 acid damage and its armor class is reduced by 1 until the start of your next turn. A flammable object hit by this spell ignites if it isn't being worn or carried.

This spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).