This borders along the same lines as the near-infinite arrow trick, except you combine this in conjunction with Berserk.
It is noted that arrows themselves are decremented when it is the character's turn. So if the final arrow is used in a battle-ending blow, it is not decremented.
Combine this with Berserk, which prevents you from taking input, you can make any arrow wielding character pretty much work on an awesome budget, until their turn manages to come back up via Dispel, Black Hole, Death, and Stone statuses...