Talk:Combat Mechanism/@comment-82.55.26.42-20150206181046/@comment-26044227-20150206182130

Horses can't be destroyed, don't worry.

And when a sword ranks up their stats increase (if you've noticed, leveling normally doesn't change their stats at all). After they rank up it's the best time to refine them and get them to their max stats. Don't do it before, because all bonus stats gained  by refining and internal affairs are lost once they hit rank-up status.