Previously, Zhen Xi didn't exert her full strength. First, because these weak creatures of the Demon Realm hardly motivated her.
And second, she was simply too powerful.
Moreover, perhaps due to her innate talent, although she was strong, her control over her power was as unrefined as Bai Shi's. She couldn't be sure that if she let loose, she wouldn't accidentally harm these people around her.
It's like a person walking down the road might accidentally step on an ant; you can't know if the ant managed to escape through a gap in the shoe or got crushed to death.
This analogy isn't excessive, even for Heavenly Venerable Level power.
Even though Zhen Xi and Manoros had been battling thousands of miles away, a group of Heaven Realm Martial Artists could still feel the terrifying aura waves. Even top-level Heavenly Kings like the Daolan Heavenly King couldn't be sure if merely brushing against such terrifying power would end his life.
