"So," Cheng Ziang continued, "we should maintain the mystique of the saints and conceptualize this Nascent Soul-like power as divine power. Only then can we create a sense of the unknown and instill fear in the people of the East Continent. Otherwise, having a Nascent Soul realm expert with us is essentially as dangerous as possessing a valuable gem—there will always be people lusting for power and specifically targeting us."
Indeed, according to this theory, the Advance Team has two individuals with Nascent Soul, but Fulajie'er does not kill. The real threat is Liseya, brought by Cheng Ziang, who is truly a god of death in every sense of the word.
Of course, nothing can be said with absolute certainty since Fulajie'er's nonviolence is merely Luo'er's decree and not because she's incapable. In times of dire emergency, especially when Luo'er can no longer restrain her, who can say for certain whether she will lose control?