Everyone knows that Xu Fu traveled eastward to seek immortality for the First Emperor.
But no one knew that he had actually found the elixir and swallowed it secretly.
Medicine can't kill you, but it can't make you immortal.
In order to fight against the never-ending aging, Xu Fu used his own blood to refine elixir embryos, used mountains and rivers as furnaces, ancient tombs as cauldrons, and the corpses of emperors and generals as guides to create a secret art of elixir cultivation that lasted for two thousand years.
It takes twenty years to become a white elixir, one hundred years to become a blood elixir, and five hundred years to become a black elixir.
Since then, all the famous tombs in the world have been Xu's Danlu.
The dynasty can be destroyed, the royal family can be cut off, and the emperors and generals buried underground are nothing more than the medicine for the Xu family's elixir.