Your attack’s damage is halved, but ignores resistances. Choose one of the following options:
Subtract the damage from the target’s armor defense instead of applying it to the target’s hit points; this damage remains until the armor is repaired. Each point of damage reduces the target's armor defense by 1, and the armor no longer provides any resistances. You may not reduce the target’s armor defense below their adjusted reflex defense; excess damage is applied to the target’s hit points as normal.
If the target is wielding a non-magical weapon and you deal more damage with this attack than their weapon's damage die size, subtract that weapon's damage die size from the damage dealt and destroy that weapon. Excess damage is applied to the target's hit points as normal.