The Tempered Iron Bar is a material that can currently only be made from Iron Bars (made from Iron Ore in a Forge) by re-forging them in the Forge (together with some Fuel). Currently (as of R31 in May 2016) Tempered Iron Bars are necessary ingredients for crafting * Diamond Leggings * Diamond Breastplate * Diamond Pauldron * Diamond Armguards * Golden Sword You cannot find this material in treasure chests nor obtain it as a loot/pet-harvest. It also cannot be put in the quickbar nor placed into the world.