This mystery must be cast on the warleader of one warband. It allows that warleader to freely participate in ONE battle on the side of the Zodiac Council (which must be the NEXT battle that warband participates in), IF the Zodiac Council vision is active at that point. After the battle, the warband in question may return to the support of their original vision. Their participation in the Zodiac Council battle does not require cities to be bid.