Ward of Thunder

Osano-Wo's protection can be temporarily invoked for a suit of armor by casting this spell and inscribing the kanji for thunder on the armor. Those within 15' of the armor are under Osano-Wo's care, and are completely protected from non-magical fire and thunder for the duration of the spell. Additionally, any Fire spell cast by a shugenja other than yourself which targets something within the area of effect has its Spell Casting TN increased by 20