"How is this possible?!"
An Jing could tell at a glance that the three spiritual objects given by Endless Heavens were a perfect match for his needs—the Void Flowing True Glass not only could carry the thoughts of a Pure Yang Heavenly Lord, but most Pure Yang Heavenly Lords absolutely do not have the capability to partially reverse time; this is top-tier among top-tiers, and carrying the soul and spirit of a Heavenly Lord is just an incidental effect.
As for the Chongyang Primordial Crystal, it's needless to say, it's the material of world extinction that can only be born when a large world's Celestial Domain collapses and burns out. Although it's just a fragment, the core legacy incubated at the end of a large world must be above the seventh-tier Lingxiao, and even its fragments have a fifth rank, which is absolutely sufficient for the Pure Yang Realm, even more than enough. For Pure Yang to exceed the Spiritual Fiend limit it can bear is absolutely impossible.