HGd10PHB - Special Attacks - Parry

Parrying is a physical melee move that is used against other physical melee attacks. To make a successful parry, the defender must:


 * Have a Response Action available.
 * Make a successful melee Attack roll equal to or higher than the Attack they are defending against.
 * The Parry consumes the Standard Action of the one parrying but they may still use a Secondary Action or Move regularly.
 * If the Parry roll is at least 10 higher than the incoming Attack roll, and the defender knows the Riposte move, they may make a Riposte attempt.

Note, certain weapons give a bonus on Parry attempts including certain polearms and swordbreakers.

Sais are capable of two independent parries in a single Response time frame.