Let's not talk about whether a Quasi Royal Grade Spirit Weapon Spatial Ring would be able to accommodate the mountain or not, even if it could contain it, Duan Ling Tian did not have any Quasi Royal Grade Spirit Weapon Spatial Ring with him at the moment.
Only a Quasi Royal Grade weapon craftsman could craft a Quasi Royal Grade Spirit Weapon Spatial Ring.
He would have to wait until his cultivation base reached the Martial Emperor Stage before he could become a Royal Grade weapon craftsman so he could use his Origin Energy to solidify the Royal Grade Pill Fire.
