Although I never met the man, I was a literary apprentice of the mystic Toltec writer/shaman Carlos Castaneda (famous in the 1960s). You can read about what I wrote of him previously here and here on my blog. One fantastic story that Carlos wrote about was about the “death defiers” – shamans of the old world who endeavored to live forever, and actually found ways to do this. As defined by the linked site. Here is my story about a run-in with one such group of death defiers.
https://heliosjournal.com/2016/08/08/the-death-defiers/
https://heliosjournal.com/2016/08/08/the-death-defiers/