They immediately jumped into the River of Extreme Yin to fish out the Evil Qi's Origin.
This was a great feat, who wouldn't want it?
When humans jumped into the River of Extreme Yin, these ghost creatures grew worried. If the Evil Qi's Origin was stolen by humans, it would be like losing a weapon against them. These ghost creatures would not simply allow humans to take advantage of them.
For this reason, these ghost creatures crazily leaped into the River of Extreme Yin, hoping to seize the humans who had just infiltrated it.
Yang Chen took advantage of the chaos, pretending to hunt down the humans before jumping into the River of Extreme Yin.
Once he had jumped into the River of Extreme Yin, it became much easier to continue taking advantage of the confusion.
The entire River of Extreme Yin was filled with enormous amounts of Sa Qi, making it difficult for one's soul to clearly perceive what was happening within.