It is a Destiny Stone from the peak of the Divine Dragon Mountain. It was there at least since the start of the Desolate Era.
For millions of years no one was able to obtain it. Many Immortal Emperors, including Gu Chun, Fei, Fei Yang, Hao Hai, Ming Du, Qian Li, and even allmighty Empress Hong Tian had tried to obtain the Stone, but it ignored all of them.
Li Qiye persuaded the Stone to follow him, and then refined it into World Seal.
Links 6 Appearance(s) of Stone At The Peak