Prepared Prescience (3.5e Maneuver)

Just as planned.

As a full-round action you meditate on all manner of possible dangers and the means to overcome them, so that when you encounter them you can focus back to your mental preperation and gain the advantage. Once during the maneuver's duration, you may choose to use its effect. You make a concentration check as a free action, and gain an insight bonus equal to 1/4th your concentration result (maximum equal to your initiator level) on any single attack roll, opposed ability or skill check, saving throw, or AC against a single attack. Activating the effect doesn't take an action; you can even activate it on another character's turn if needed. You must choose to use prepared prescience before you make the roll it is to modify. Once used, the maneuver ends.

You can't have more than one prepared prescience active on you at the same time. Due to supernatural conflicts with the methods involved, you cannot combine this with moment of prescience and vice versa. The actual maneuver is still extraordinary.