The valley returned to silence.
Qin Liuxi learned from Zhi Cheng and the pregnant women what their roles were. For instance, the woman named Tao Hong said they were merely tools for birthing, some were deceived, others kidnapped and hidden in this Evil Valley, where they were repeatedly raped by those strong men until they became pregnant. Once the children were born, they were taken away, and the cycle began anew.
As for why they knew the children would be turned into infant ghosts, it was because one of their sisters managed to extract the information from a martial monk through various means. Such places existed elsewhere, too.
So whether the children were born or not, their fate was death. Facing such a harsh world, why bother escaping?
Don't ask why they didn't escape. They couldn't. Someone tried running away, only to be caught and turned directly into a human pig. The vat still sits in the valley.
