Twelve-Winged Dark Seraphim
What's in the box? I have no idea, but The Thearch wants it for something, so it must be important. Regardless of what happens, I can see one major problem with her plans. If Zhou Wen isn't the special person she's been waiting for, the whole plan falls apart. Prisoner should have noticed if Zhou Wen was an Earth Companion Beast, especially when he tried to possess him. Then there's the child swap Zhou Lingfeng mentioned which suggests An Jing might be the Earth Companion Beast instead.