The Flying Corpse, once it stepped into the Seventh Order, could no longer be called a Flying Corpse; within the Tianwu Realm, it was generally known as "Undecayed Bone."
Its flesh was so formidable that it remained unrotted and unchanged even after tens of thousands of years. Such a level of Yin Corpse was, except for Heavenly Thunder, virtually impossible to kill by ordinary means.
This realm was the ultimate peak for ordinary Yin Corpses. One step further, and it would transcend the Yin Corpse category to be called a Corpse King.
This was no different from Immortal Path Cultivators, who, upon stepping into the realm of True Immortal, undergo a qualitative transformation.
Every tribulation a True Immortal overcame meant a qualitative transformation, and their combat power would swell by more than dozens of times.