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Wall: As a standard action once per day, the wielder can drop this kind of shield at his feet and command a wall of ectoplasm (as the power) to come into being, with the shield as the point of origin for the effect. This effect forms a wall whose area is up to twelve 10-foot squares or a sphere or hemisphere with a radius of up to 12 feet. The wall dissipates after 7 minutes, or sooner if the wielder of the shield reclaims it (thus dismissing the effect).