Dark Iron cannot be crafted as normal objects, but it is created by placing an Iron block and then igniting it with a Wrath Igniter. The wrath fire will spread to all contiguous iron blocks, converting them all. Once the wrath fire is finished, normal fires will be ignited in the area and can spread to flammable items.
Dark iron blocks can be crafted into 4 Dark Iron Ingot.
Video Tutorial to make Dark Iron IngotsEdit