Gladdenglass

"So much history, so much life. And it's all gone, it meant nothing in the end. Everything means nothing, if the greatest like you should fall how shall i compare in life" - King Herir when he destroyed Gladdenglass castle, after the Red Cap rebellion.

The Gladdenglass mines.
It is foretold that magic is in everything, even rock and metal, the Gladdenglass mines proves this.

When Jocelyn explored goh'lam she found the Gladdenglass mines, and inside she found glass ore, with this she could not only use magic but also pure magic which she would later on perfect and write about in many secret books scattered around the Tears. Glass ore can be used for many things the most common is magical weaponry or pure magic.