This is dark fantasy/horror story, stylized as an ancient oral legend, which tells the story of a simple man's journey and gradual descent into darkness - and ascension to power.
If You prefer to read: https://adeptusrpg.wordpress.com/2022/12/14/tale-of-the-necromancer/
If You prefer to listen: https://www.youtube.com/watch?v=KCdlph835qc