There was an alchemist who was good at medicine and his Taoist companion who had been unable to have his own flesh and blood for tens of thousands of years. During an accidental adventure in the ruins, he discovered a formula that could make an elixir. As long as he and his Taoist companion combined their blood, they would have the opportunity to transform into a human form. It is difficult to find the materials for making elixirs, but during the long years of refining medicine, both of them have saved many precious medicinal materials, and only this last one...
Intention: No specific intention