Prerequisites: Shield sphere, ability to cast a spell or magic sphere effect that grants a shield bonus to AC.
You may concentrate your wards, shaping and hardening them, employing them in place of a physical shield. While you receive the benefits from a magical effect that grants you a shield bonus to AC, you count as possessing a light shield for the purposes of Shield sphere abilities and for making shield bash attacks with an enhancement bonus to attack and damage rolls equal to the granted shield bonus to AC. If the effect has a caster level of at least 10, you may instead count it as a heavy shield. You must have at least one empty hand to use this feat.
Using such an empty hand to cast a spell, make an unarmed strike, hold an item, perform a combat maneuver (other than with the shield granted by this feat), or similar activity removes this ability until the start of your next turn. For the purposes of shield sphere abilities that allow damage to be directed to your shield, treat the ‘shield’ granted by this ability as having hardness equal to 5 + its caster level and hit points equal to 10 + twice its caster level. Should the ‘shield’ take enough damage to gain the broken condition, the effect granting the shield bonus is suppressed for 1d4 rounds. If it is destroyed, the effect granting the shield bonus is instead suppressed for 1 hour, though it may be cast again to regain its benefits.