Talk:Iwatooshi/@comment-121.7.132.3-20150414121614/@comment-219.79.135.244-20150414132610

Level up a sword like you'll level up any sword. There are two ways:

1) Put in 4 higher level swords (at least a higher level oodachi would be good) in your party and 2 lower levels, then test your way up and see which map you can defeat with close to no damage taken.

2) This will be long and boring kind of grinding but it will make sure none of your sword will break: Doesn't matter what levels they are, put together a team, calculate the average of that team and check with http://touken-ranbu.wikia.com/wiki/Sortie the lowest level map that you can grind on without going over the level limit for EXP, then keep grinding there till you're over the limit of said map, move on to the next.

As for Iwatooshi, he's pretty useless until at least level 60+. At that point, you can make a team of Iwatooshi + low levels and work your way up the maps. Keep note on the highest level map he can One-Hit-KO entire enemy's team, then you can grind there. Iwatooshi needs to be at least 20+ levels above the enemies for him to be useful.

Don't forget the leader sword always get more exp even if they're not the MVP :)