So I randomly went back to the underworld to check and found this
The guide doesn't contain this, and also
I don't think there's anywhere I can find a name for it. I tried searching around the underworld, temple, all 3 dungeons, and even replayed the auction part with high int to check the library, but nothing showed up. I've only played the good route though, so I'm not sure if Selye has anything to say about it.
Is there any content for it?