Sky Melting Mountain, an active volcano.
Yet, it was unlike any ordinary active volcano, or else Gongye Baiduan would not have chosen it to be his place of reclusion. As a generation's Sword Casting Master, even when selecting a place to live in seclusion, he sought a location beneficial to forging.
Sky Melting Mountain had once been struck by a meteorite from beyond the heavens.
If it had occurred in Qing Yu's previous life, it would have been nothing extraordinary, at most becoming a momentary marvel. However, in this Martial Arts World, under the influence of some unknown factors, the mountain underwent a wondrous change.
Using the terms of this world, it meant that the heavenly fire and earthly fire collided and merged, making it a geomantically treasured place for weapon forging.