Where did the rumor of the curse come from? Obviously, that came from Nyxara. That was the idea she had. Since they knew that Hyeoumu's Jade Color wouldn't change after being infused with Divine Energy, they could use that information in their favor. The main point was that the lie about the loss of lifespan couldn't be proven to be true or false.
The twins' group had no reason to refuse to put that idea into practice, and they got the Big Five of the Cloco Divine Ocean to spread that rumor. Sure enough, it eventually reached Zuco, the one Sea Demon Beast that had Hyeoumu's body in his care.
That wasn't everything, though. As the rumor circulated, a new piece of information was released by the Big Five. This information, obviously, was official. Different from the rumor, which most didn't know where it originated.
