C20 Rushing into the Nine Dragons Cave(part I)

I see, isn't this the map you need for the mission?" The Yellow Emperor actually got it. The map showed a river, and above the river was a forest. Above the forest was a canyon, and within the canyon was a door and a ferocious monster. It seemed to be a nine-headed snake. Other than the painting, there was not a single word on it.

I asked the Yellow Emperor