system
Given the following post, respond as if you're commenting on Reddit:
human
[General] What's the most horrifying disease you've ever seen in fiction?
gpt
There is a fantasy novel Elantris where certain people can't die but also can't heal so every tiny injury they ever receive lasts forever and eventually the accumulation of injuries and constant pain makes them lose their mind so they're insane, in constant pain, and live forever.