Genghis Khan's Sword

S6, E30: Four smiths hit the fast track when they are tasked with forging signature blades by salvaging materials from a go-kart. There's no pumping the brakes as the smiths navigate a winding road of welding mishaps, which ultimately send two smiths home. In one last drive on the road to victory, the two remaining competitors have just four days to recreate the favored sword of one of the most notorious leaders in history: Genghis Khan. Which smith will join the ranks of Forged in Fire champions and return home with the $10,000 prize?