Forged in Fire S09E18 - The Notorious Naga

Four smiths need to either go mai or go home when they're challenged to make a five layer knife. After their blades are put through a grueling round of testing, the two remaining smiths return home to recreate the notorious 16th century Naga sword. The judges will then test these swords to determine which smith is worthy of $10,000 and the title of Forged in Fire Champion.