This effect will cancel the next effect delivered with the Spell qualifier cast at the recipient, including beneficial spells, after which it is used up. The recipient must say “Spell Shield” to inform the caster that the spell was returned. It does not protect the recipient from the Magic damage effect or any other qualifier such as the Weapon qualifier.
This spell lasts until used or Dispelled and cannot be used in conjunction with a Reflect Spell. If you have a Spell Shield active, you may still “accept” spells that are touch-cast, though you must be conscious to do so.