In keeping with the extant nature of Final Fantasy XI's crafting, synergy doesn't promise to be simple. A number of reagents and elemental energies are dumped into the pictured "synergy furnace," at which point the entire part must begin carefully modulating and controlling the flow of elements therein. Crystals can be used to help alter the elemental composition, but will not be absolutely necessary from the sound of things. A failed synthesis can cause the whole mess to blow up in your face -- literally -- while success yields both slotted items and "cinders" that can be turned in for equipment to help boost your skill at the craft. There's a lot to digest here, so take a look and get ready for the most mold-breaking crafting yet seen in FFXI.