Talk:Kebiishi/@comment-202.73.50.242-20160701062925/@comment-130.180.251.87-20160701074622

They don't appear terribly often anymore, but when they do they may cause problems for you. Depending on how you like to level your swords, if you use 5-4 to level them from around lvl 65 or so all the way to 99, I feel you will encounter many KBC to a point where they will become quite a nuisance for you. Even if you keep your swords around the same level, once they level up and hit the next strength tier they'll perform poorly with the corresponding KBC composition. On the other hand, people have said that infesting World 6 with KBC worked out well for them, since the night battle mechanics apply to KBC as well, thus weakening them. So I would suggest infesting 6-3 over 5-4 definitely, but how tideous the grinding would be at 6-3 I cannot say since it's been a while since I cleared that map.