Disarm

Feat Description
The character can perform a disarm maneuver that does no damage, provokes an attack of opportunity, but potentially renders the target unarmed. The attacker attempting the disarm makes an attack roll against the target at maximum BAB modified by the difference between the attacker's size and the target's size times 4 (so a medium human disarming a small gnome is at +4).

The attacker gets a further modifier of 4 times the relative size of his main-hand weapon (so small Halfling wielding a medium-sized longsword is at +4). The defender makes an attack roll to resist the disarm using his maximum BAB modified by his relative weapon size times 4. If the attacker meets or beats the defender's roll, the defender's main hand weapon is disarmed, knocking his on-hand item to the ground. Disarm will not work if the target's weapon cannot be dropped.

A disarm attempt provokes an attack of opportunity.