TRUE DRAGON'S SPIRITUAL ROAR!
The true dragon's roar was a mythical legend even those at the Resonant Soul Realm feared. It was sacrilegious for the True Dragon Transmutation Method, an art that was designed to generate a lineage of dragon-blooded cultivators that may eventually free the captive dragons of the Auric Sea, to be named as such.
The majesty of a True Dragon could not be easily displayed in any art, spell, or method. If the dragons beyond the Sealed Regions knew of this act, they would eradicate Anu's grandmother's lineage from existence. However, to Wei Wuyin, the sole cultivator of the Sealed Region, no, the sole being in the Sealed Region, to possess a True Dragon Bloodline, this fit him as if it was his destiny to obtain it!