
caith |

The entry for Elysian Bronze states:
"A weapon made of Elysian bronze adds a +1 bonus on weapon damage rolls against magical beasts and monstrous humanoids; this damage is multiplied on a critical hit. After a creature uses an Elysian bronze weapon to deal damage to a magical beast or monstrous humanoid, the wielder gains a +1 bonus on attack rolls against that specific creature type (for example, against chimeras, not all magical beasts) for the next 24 hours, or until the weapon deals damage to a different kind of magical beast or monstrous humanoid."
So how the heck would this work for Ammunition? Does it only ever give +1 to Damage, and is incapable of activating the +1 to Attack? Seems kind of useless for 21gp, eh?

Broken |

Well probably shouldn't affect them with the bonus, but you could rule it that the Elysian Bronze is like poison and that further arrows after the first get the bonus on that one creature.
or that the sudo-mystical abilities affect your character, and you have a bonus while wielding Elysian bronze.
Strictly speaking, I don't think it would work well on ammo.