A tachi forged by a Bizen-style swordsmith known as Osafune Kanemitsu. During the Edo period, the "sword tester" Yamada Asaemon declared this blade to be Japan's finest sword. His testing technique involved actual use on prisoners, corpses, and such.
Change to Attack (Heart)
Change to Attack (Strength)
Change to Attack (Skill)
How to Obtain
Crafted at the forge, random loot drop and mission reward.