Nothing is worse to an archer than showing up to a battle with iron arrows
against a stone golem, or bolts of fire against a lava monster. Given time,
preparation, and ingredients, ammunition can be permanently modified to apply
a certain type of bonus damage (such as cold or poison), or to remove an
unwanted effect.
Syntax: use modify ammunition at <ammo> add <bonus damage>
Examples: use modify ammunition at arrow add fire
          use modify ammunition at bundle add <chilling>
          use modify ammunition at handful of 20 bullets add clear