I think there is a mention of monsters in Shan Hai Jing.
The system of authenticity comes from ancient myths and legends in China, which is a perfect feature, so perfection has many elements of China.
Generally speaking, it is based on the ancient myths of China, so all the related ancient books should be referenced.
Zulong Studio's initial setting of perfection should all be China elements. After I left, I added a lot of things that were different from the original settings perfectly, so those background settings became less prominent.