Diamond Mind: Disrupting Blow

As part of this maneuver you make a melee attack. If this attack hits, your target must make a Will save (DC15+your Str modifier) or be unable to take any actions for 1 round. The target does not suffer any other drawbacks or penalties. He can still make attacks of oppourtunities but is unable to take immediate actions until his next turn.

(Pg 63)