Originally Aster wasn't going to meddle with all these people, earlier Felicia killed the snake eyed guy because he was trying to incite others to attack them, but their goal was to find that giant undead and take it down for its yin accumulation crystal.
Aster was fair with rewards and punishes, so the more they contributed to the group, the more rewards they will get, and yin accumulation crystals are one of the few types of resources, that can improve women's cultivation, regardless of path, or the manual they are using.
The only exception were those rare cases of girls who were born with yang constitutions, but there wasn't anyone like that in the group anyway.
Aster felt the greedy gazes of the other cultivators, not only spreading towards the red cover book and the flag on Felicia's hands, but to the girls and he shook his head, there was no reason to hesitate in what to do.
"Kill them all".