C1729
Chu Yan felt a bit of pressure facing the Sky Flipping Seal.
However, it was just a "sliver".
On the surface of the Sky Flipping Seal, the flow of infernal energy and blood light could be seen.
This infernal energy and bloody light clearly came from the Black Dragon.
However, the Black Dragon was killed by Chu Yan, so the Sky Flipping Seal lost control at this time