Board Thread:Questions and Answers/@comment-36.77.78.238-20160801172443/@comment-24356739-20160805001458

You can still grind lower level maps that has kebiishi with your Lv10+ tantous as long as they're in the same range.

If you do not have enough similar leveled swords to fill in the 6-member team, bring in spares you get from drop or daily smithing. Since your team is generally still low levels the spares will be catching up to your tantous soon and even out the levels.