"Oh, no! Isa lost the blueprint of this article!"
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The Ronin Katana is a locked Light weapon in Infinity Blade III. It serves as the reward for the 47 Ronin Challenge, a ClashMob that gave the entire Infinity Blade III community 10 days to kill 4,700,000 Samurai Brutes. It is used by Isa. The sword, when not upgraded, is rather weak, but is powerful when it has been upgraded to a high level.