In order to craft his own Innate Treasure, the Saint of Taiqing had once borrowed the Tai Chi Diagram and Pangu Banner from his two elder brothers, often holding them in his hands for contemplation. Therefore, he would never mistake the Duotian Shenfan, created by the Twelve Ancestral Witches, for anything else, as it looked exactly like the Pangu Banner.
No, not only did it look alike, but the abilities it possessed were also identical.
The Pangu Banner, formed from the blade of the Pangu Axe, possessed the might to tear apart Chaos, the power to shatter the force of space-time, the function of dominating all laws, and the capability to pioneer sky and earth.
It was known as the bane of all defensive magic treasures and also had the ability to control the imposing force of Heaven and Earth. Its offensive power was deemed the first under the Heavenly Dao, with might even surpassing the Slaying God Spear.