Sunder (PSR Supplement)
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Sunder is the act of damaging or destroying an item wielded or worn by a creature.
When you hit a creature you can see with a melee attack, instead of dealing damage you can attempt to Sunder an item you specify that is worn or wielded by the creature. To do so you must make an additional attack roll against the item's AC (which is typically 15), and on a hit you deal damage to the item.
Both attack rolls must hit to damage the item — otherwise the attack misses entirely. You couldn't, for example, hit the initial attack roll but fail the second, then decide to damage the creature anyway.
Assuming your campaign has attire slots, a damaged piece of armor has its AC Bonus reduced to 1 if it would otherwise be higher. Some other items may have reduced effectiveness while damaged.
If an item's hit points are reduced to 0, it is destroyed. Typically a destroyed item can be restored only during downtime, often at great effort or expense.