Magically provides the benefit of a shield without a shield.

Shield [30] 
    Enhanced Defenses (Dodge) 4 [18] 
    Enhanced Defenses (Parry) 4 [12] 
    Does not work while holding a shield [-40%] 
    Magical [-10%] 
    Spell Components [-20%] 
        Must say "shield" in Latin 
        Must briefly hold arm out like wearing a shield