International Championship: Four of the top smiths from around the world compete in an international championship, with the best two crafting a Spadroon in the final. (S4, ep 20)

The Yatagan: The smiths are tasked with turning a rusted 1971 Mercury Cougar into their signature blades, before creating an elite military weapon known as the Yatagan. (S4, ep 19)

The Kpinga: After layering a complex Damascus pattern in their signature blades, the remaining competitors recreate a three-bladed African throwing knife called the Kpinga. (S4, ep 18)

The Kampilan: Four bladesmiths head to a scrap yard to create their signature blades, then recreate a fearsome battle weapon known as the kampilan. (S4, ep 17)

The Shamshir: The contestants get to work on a unique bowie knife in the first round, before two will go on to craft a deadly sabre called The Shamshir. (S4, ep 16)

Redemption: Four previously eliminated bladesmiths return to the forge for a shot at redemption, but they face a challenge more difficult than they could imagine. (S3, ep 16)

Tabar Shishpar: Four more bladesmiths head into the forge to prove they have the mettle to master metal. (S4, ep 15)

The Pata: Former winners return for the chance to craft a weapon known for its unique mechanics and deadly double-edged blade: the pata. (S3, ep 15)

Ngombe Ngulu: The competing smiths must forge a weapon from an elevator cable, before two go on to recreate the African Ngombe Ngulu - an executioner's sword. (S4, ep 14)

The Zweihander: Four competitors must weld blades from tiny cubes of steel before two go on to forge the mighty German Zweihander. (S3, ep 14)