The mage can now cast a Magic Shield on another person.
See Magic Shield, for the effects. If the target does not have his own Mana, the caster must incorporate Mana during casting to allow it a number of charges. The subject can choose when a charge is activated.
Guardians of the Veil Rote: Invisible Boon
Guardians sometimes cast this rote on Sleepers to keep them safe from spells that might otherwise alert mundane folk to the working of magic.