It is without doubt related to ready player one. The skull seems to fit aswell. Now the question is - what is the password?
what i have tried:
human skull
sha256[human skull]
sha128[human skull]
the Tomb of Horrors
sha256[the Tomb of Horrors]
sha128[the Tomb of Horrors]
Tomb of Horrors
sha256[Tomb of Horrors]
sha128[Tomb of Horrors]
and now i'm honestly tired of bruteforcing.
If anyone has the physical book they might want to look at line 51 of chapter 7. But i can only find ebooks and they dont break lines at the same place.