Normal: With a few words of truespeak, you make an arrow find their target.

The target's next ranged attack is guided by you. You may choose to alter its path after the attack roll is made and choose any target within 9m of the original target. The new target must be within 9m of the old target and has to perform a reflex saving throw to evade the attack. You may ignore cover other than total cover and even let the arrow reverse its flight direction to have another try at the original target. The utterance increases the damage of the arrow by 1d6 per caster level. After the ranged attack is performed, the utterance ends.

Reverse: Your utterance wards an ally from harm, preventing the arrows of your enemies from finding their mark.

This duplicates the effect of the protection from arrows spell. At fifth level the damage reduction against magic increases to damage reduction against all kinds of materials.