I don’t know about “most horrifying”, but I spent the last couple hours reading it, and it’s pretty damn good. Just… be prepared for 2 or 3 really graphic and fucked up torture scenes (that the victim willingly agrees to).

The whole Death Jockey thing is kind of shocking and terrible, but also seems like a perfectly understandable result of making everyone immortal and needless.

Oh yeah, I remember reading this (and other stories by the same author) on Kuro5hin decades ago. I’m not sure I agree with the superlative, but it was definitely a freaky story.

Haven’t watched the video version yet, but from the first few minutes it seems like just an audio book of the text.