In the Black Myth instance, Nezha, who had been betrayed by his biological father, taken over by Black Spirit Mountain, and stuffed into a lotus pond to be reborn as a new guardian deity utterly loyal to Black Spirit Mountain, had appeared in plain sight in the Scorching Sun's laboratory—and clearly as an experimental subject.
However, Nezha himself had made that decision.
Although Black Spirit Mountain had been conquered, the incomplete body Nezha had constructed by absorbing the flesh and blood of countless victims truly existed.
If Black Spirit Mountain had still stood, Nezha might have chosen to endure humiliation and remain in that lotus-root body. Once he successfully revived in the future and recovered his powers and treasures, he would surely make Black Spirit Mountain run with blood and chop off Black Li Jing's dog head!
But the problem was that Black Spirit Mountain had been destroyed, and the cold Black Li Jing had turned into a warm treasure chest. This instead left the successfully rescued Nezha without anyone to take revenge on, and without any reason to keep that sinful body.
So, at his strong insistence, that lotus-root body, which had grown on nutrients from the victims' bodies, was buried with Arcade Nezha's help. Meanwhile, he was extracted early in the form of a lotus heart and personally sent aboard the Scorching Sun by Arcade Nezha.
Black Myth Nezha chose to join the Scorching Sun Legion and worked hard to regrow himself, with the goal of becoming Cheng Tian's guard.
Of course, he did not intend to be Cheng Tian's guard for the rest of his life. But in his view, he at least had to repay the favor to a degree equivalent to "killing Li Jing" before considering anything else.
What was rather interesting, however, was that