Mysterious I Came a Billion Years Later

Across a billion years, Lin Tian has become the guardian spirit of a beautiful woman in a billion years, and can freely travel between two eras.
Antiquity is the law of this era, and the more ancient the exercises are, the more powerful they will be after a billion years.Lin Tian, ​​who came from a billion years ago, said that this era is dominated by me! 』