Shen Yanxiao's rise was a god-like legend to others, but only Xiu and her friends from Phantom knew how much she had sacrificed for all of this.
How many times had she fallen sick due to overexerting herself? How many times had she fainted from training?
Before she became the City Lord of Sun Never Sets, Shen Yanxiao did not have any free time to speak of. She only trained everyday.
People from the Broken Star Palace also trained everyday, but their hearts were not as pure as Shen Yanxiao. The former did it for themselves, but Shen Yanxiao did it for the people around her.
To protect what she cared about.
Only when one had someone to protect would one maximize their potential.
Killing for the sake of killing and killing to protect others were two different concepts.