Dark Mist Era

In this continent filled with thousands of ethnic groups. The human race has unique wisdom and understanding. In the long river of time, with continuous evolution and exploration, the human race has created a new era. They began to expand their territories aggressively, and in order to satisfy their greedy desires, they continued to erode other races and became the true overlords of the continent. I don't know how many years have passed, but this situation has been broken! Strange trend? Secret? Or some other unknown creature! It came quietly accompanied by the black mist!