Musashibo Benkei's naginata. He is dressed like a monk and tends to laugh out loud very often. He is implied to be very tall compared to the Saniwa.
As Benkei was a retainer of Miyamoto no Yoshitsune, Iwatooshi is often seen with Ima-no-tsurugi.
In-game, he begins with low attack power but with the ability to attack many targets at once. Once he gains levels and he is fully refined, he gains enough power to mow through several armies at once, eventually being able to clear high level maps almost by himself.
