Myth of Continuity

What is the secret behind the elixir of longevity, a magical elixir of longevity? Why was Cui Wenzi able to successfully develop the elixir of longevity? Who is he? What power does that mysterious bronze treasure box possess that can allow Yi Xiaochuan to travel through time and space? . Yushu actually took the longevity medicine to see if she could be resurrected. All the wonderful things are only in "Xianxu Myth" and all the bizarre stories are only in "Xianxu Myth"