The refining of the Yin Soul Banner did not require any precious materials. It only required banner poles and banner surfaces of superior Yin and cold attributes to be successfully forged, and did not call for anything specific.
As for the banner pole, Hun Changqing's Supreme Yin Black Death Wood was extremely suitable. Furthermore, it was connected to his origin source, making it very smooth to use.
As for the banner surface, there was still a python skin of the Nine Netherworld Python inside his Storage Ring that he had slain within the Soul Clan. The Nine Netherworld Python was practically the magical beast with the most powerful Yin and cold attributes on the Dou Qi Continent, and its hide was exceptionally tough and elastic, making it the most suitable material for crafting a banner surface.
It could be said that Hun Changqing had already possessed the most basic conditions to create the Yin Soul Banner at this moment, but the crafting of this pole and surface was not the most important part. The reason the Yin Soul Banner could be recorded in the Supreme Yin True Explanation, with its described might being immense, was not simply something that could be achieved by piecing together two kinds of Yin and cold attribute materials.
The most crucial aspect of the Yin Soul Banner was still the Yin demons contained within its banner surface. Yin demons were refined from the souls of living people through the immersion of Supreme Yin True Qi. Yin demons were treacherous, and ordinary energy and physical strength could not touch them by even a fraction, moreover, they would devour energy and souls-they were extremely terrifying.
If Hun Changqing could refine hundreds of thousands, or even tens of millions, or up to a hundred million Yin demons and