Xonolite
Xonolite is a type of metal that was located on the planet of Mustafar. The Jawenko lava beast possessed the ability to change xonolite between its solid and liquid forms with ease. Smugglers from Mustafar were known for shipping liquid xonolite to Nkllon, where it was then sold under the name Nkllonian lava extract.
Behind the scenes
In Underworld Appendix: Swoops, Spice, and Wretched Rogues, the spelling of this metal appears as "xolonite."