In the beginning, there was only one earth. The land of many species. Humans, the highest species dominated the earth. It was like a heaven for cultivation as the mana was so dense and pure. Human journey continued as they grow stronger, it wasn't long before the first human break through the mortal limit and ascended into the realm of the immortal. After reaching the immortal realm the human discovered that he couldn't interfere into the matters of mortals without been punished by the universe. Soon a staircase opened at the centre of the universe leading into an unknown place. Some humans tried to follow it but the pressure killed them all, it didn't matter how strong they were they weren't able to escape the pressure of the stairs once it descended.