When a weapon reaches 0 durability it will break. You will lose it and be automatically equipped with the one weapon that doesn't break - your initial equip, the Light Stone.

While it doesn't have skills to unlock and is pretty weak, it can inflict Blind on an enemy and will not break on you.

They come from the DS resource pack. I thought, why not? Since it's a short game, why not use some different enemies? ^.^