As for Yan Qingying, although she also possesses twelve All-Heaven Netherworld Banners, she can't plant them all behind her at the same time—a maximum of nine is allowed. This is a clan rule that no one dares to violate, because doing so is a symbol of sedition!
Clothed in a black Chaos Armor with a black and white Taiji Shield covering him, holding the Bane of Immortals Sword, and with the All-Heaven Netherworld Banner on his back, along with a dark cape forged from the Chaos Cauldron, having the property to devour anything—this was the appearance of Xin Yun and the Death Legion!
The Chaos Armor was not heavy armor but a fully covering light plate armor, even encompassing the eyes and wings. Purely based on appearance, one couldn't distinguish one from another; the only thing that could indicate rank was the number of banners planted on their backs!