Gu Yun

Gu Yun is a pure-blooded ferocious flood snake that surrendered to Su Zimo  in the Valley of Ten Thousand Demons

And the blood of Gu Yun's  cannot even be called the blood of the mixed dragon of the dragon bloodline in his body is not only so thin  mixed dragon bloodline that  the bloodline in Gu Yun is almost indistinct to pass as mixed dragon bloodline.

For Flood Dragons has mixed bloodline which is impure. So Gu Yun moreover  that cannot be even the dragon's legacy as the dragon Long Yan point of view.Chapter 1050