Forged in Fire (2015)

S06E15 The Nagamaki

Four bladesmiths face a tough challenge as they must craft unique blades using gym equipment. The competitors put their skills to the test, struggling with issues like forge welding mishaps and distortions. After a grueling series of challenges, only two smiths remain, each given four days in their own forges to replicate one of Japan's most formidable weapons: the Nagamaki. Who will perfect this massive sword and claim the title of Forged in Fire Champion, along with the $10,000 prize?