Did you ever hear the Tragedy of Darth Plagueis the Wise?
I thought not. It's not a story the Jedi would tell you. It's a Sith legend. Darth Plagueis was a Dark Lord of the Sith who was so powerful and so wise he could use the force to influence the midichlorians to create... life. He had such a knowledge of the Dark Side, he could even keep the ones he cares about from dying. The Dark Side of the Force is a pathway to many abilities, some considered to be... unnatural. He became so powerful that the only thing he feared was losing his power, which eventually, of course, he did. Unfortunately, he taught his apprentice everything he knew. Then his apprentice killed him in his sleep. Ironic. He could save others from death but not himself