Ultimate Team Challenge: Four master smiths compete alongside their apprentices to forge an iconic weapon of warfare, the trench knife. (S4, ep 30)
The Navaja: Four bladesmiths test their mettle in a rock quarry before two go on to recreate one of the most dangerous folding weapons in history, the Spanish Navaja. (S4, ep 29)
Sica Sword: The smiths must forge a signature blade out of a flintlock pistol before two go on to craft the lethal gladiator sword, the Sica. (S4, ep 28)
The Rhompaia: The bladesmiths are forced to achieve one of six Damascus patterns for their first round blade, before two go on to forge the fearsome Rhomphaia sword.
The Schiavona: The bladesmiths must harvest steel from farming tools before crafting the decorated and deadly Schiavona sword.
Jumonji Yari: After forging functional friction holders, two finalists go on to craft a Japanese trident called the Jumonji Yari, a weapon of unparalleled strength. (S4, ep 25)
The Horseman's Axe: Four bladesmiths are pushed to their limits when they must forge a signature blade from springs of steel, before recreating the mighty horseman's axe. (S4, ep 24)
Viking Edition: Competitors march into a dry moat where they resurrect old swords and forge them into a Viking Seax. (S4, ep 23)
Ultimate Champions Edition: Five champions return to the anvil, with the final two competing to craft the finest Tai Chi sword. (S4, ep 22)
Knights Templar: The smiths must forge together rusty chain mail and high quality steel to produce weapons used by the Knights Templar. (S4, ep 21)