Originally published at: Making the Acid Maleficence Scarier — Errata — Advanced Old School Revival — OSR+
To make the Acid maleficence more fearsome as a maleficence, and to distinguish its ability to bypass soak from the Piercing tactic, the Acid maleficence now also has the potential to destroy items.
Damage caused by this maleficence ignores soak conferred by armor. Additionally, a successful hit with the maleficence destroys a supply (or equivalent declared item of the victim's choice): on 1-3) consumable, 4-5) cheap, 6) luxury. If a specific weapon, shield, or other mundane object is the target of the maleficence, the victim must make a spell check vs. your attack roll, or else the item is destroyed. (Entire suits of armor cannot be destroyed by acid in this way.)
Under these new rules, treasures are functionally immune to being destroyed by acid.