In this competition, it's all about Japan's shadow warriors--the ninja. Four smiths are challenged to forge their own version of a ninja blade, and in a Forged in Fire first, the smith with the lightest blade wins an extra 20 minutes in the second round. See more in Season 9, Episode 3, "The Ninja's Sword."
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"Forged in Fire" features world-class bladesmiths competing against each other to create some of history's most iconic edged weapons.
Learn more: https://www.history.com/shows/forged-in-fire