Diao Yu is shopkeeper of shop "North Kingdom Cold Wind" located in Antler City and disciple of Exteme Ice Holy Palace.
A blue clothed pretty woman.
She gifted Su Xing one piece of Ice Kite Arctic Stone for which he said that was defected. Although she knew he cheated, she gave him ore because she realized his master is Ju Yueke and it is worth making friendship.
Those tool refinement scholars, you could give them ten pieces of Ice Kite Arctic Stone and they still would not necessarily put it in their eyes, but as far as the tool refinement master that had only set out without showing any indications, one piece was sufficient to make them engrave him into their memories.