To explain more in depthly, Grathmeld is the process in which the characteristic wave frequencies (Spectrums) of the Grathnode Crystals are scanned by the Silver Horn, and then, it runs a program depending on that frequency, granting the Symphonic Power and effects carried in the crystal to the item. The people of the Wings of Horus developed this technique even further, to the extent of even being able to make airships with it. The people that practice this technique are known as Grathmelders, or by the shortened form, Melder. This technique was spread at the start of the Third Era by a man and a woman called Gasaki and Leila. Who they were, from where they came, and what happened to them is still a mystery.