An advanced version of Defend that allows a shield bearer to Perfect Block incoming attacks when blocking is well timed.
For tactics, usage, and details of perfect blocking, see Perfect Block
To perfect block, press [Block] just as an enemy is about to make contact with an attack -the perfect block causes a strong knockback effect, reflect substantial damage back to the assailant, and has a good chance to inflict a debilitation when used in combination with an enchanted or special shield.
When perfect blocks are not acchieved the shield functions as it does with Defend.
The equivalent Mystic Knight skill is Reflect, which can have additional magickal effects.