Sardonikium

"Sardonikium. I assure you, there is at least one city on any planet inhabit by the Xai built of the stuff."

- Caraid Finneran, Elysian explorer

Sardonikium is a jet-black crystalline material, with a slight purple to violent tinge to it, which is produced and utilized by the Xai species native to Xyon. Though its suffix give the impression that it is a metallic element, its is extremely unique in that it possesses many of the qualities from both metals and crystals, and surpasses anything used or even known to the relatively younger species in the galaxy. It stands side-by-side with nullium and nishatium as one of the three major elements used by the Xai as the foundation of their civilization.