Talk:Kebiishi/@comment-131.212.242.66-20150415140653/@comment-26289928-20150415141305

You can still fight kebiishi for your sword's level group (10~29) with lvl 19 swords, however KBC are easier to kill if you're nearing the highest level of your group, since the stats for KBC for that certain level group stays the same until you reach the next tier (when one of your swords are level 30). So if you're fighting the KBC with higher levels in the level range it will be easier.

Start grinding at around level 26, and stop the second once one of your swords reaches level 30.