Great Spiritualist from Another World

Traveling through another world, I didn't expect that the world of Lingyuan had come to an end. After lingering for ten years, Xiao He finally perished together with the Lingyuan world. After opening his eyes, Xiao He unexpectedly discovered that he had actually returned to a million years ago when the Lingyuan world was destroyed! At this time, spiritual arts are still on the road of exploration, and the uses of most drugs are still unknown...