arrows, bolts: deflected
arrows, bolts fired from (cross-)bow with silver nocking point attached: -8 to hit
thrown weapons, siege weapons, rocks, thrown humanoids: 30% miss chance
Up to three times per day, the wearer can change the energy damage of a fire spell she casts to cold, a cold spell to fire, an acid spell to electricity, or an electricity spell to acid.
It seems to me it is just part of the spell beeing cast and requires no action. My GM ruled in the last session it requires a standard action and affects the next appropriate spell.
Quote:
Activating a magic item is a standard action unless the item description indicates otherwise.