Russian Sleeping Experiment and Ghouls
The way the Pactverse interprets Ghouls and undead things in general stuck out to me as, maybe not an extremely original twist but nonetheless a notably interesting interpretation.
The setting as a whole seems to be defined by creepypasta just with some infusions of older and more generic urban fantasy.
Many Others are basically creepypastas, the kind of short story that's passed around the internet that blurs the lines between the fascinating, the disgusting, and the plausible.
I'm sure someone else could define the tone and content of creepypastas much more precisely but that's the correlation my mind has been making as I read Pale and Pact.
Which brings me to the title. For those who don't known Russian Sleeping Experiment is a 15+ year old creepypasta about a supposed well you know russian sleep experiment where Soviet scientists used a special gas mixed with the air to keep humans awake indefinitely, observing the increasingly horrifying effects as their insanity grows.
Complete fiction obviously and based on rather insulting ideas of Soviet science.
But in the Pactverse I could see it becoming an origin for a subtype of Ghoul.
I liked the idea of the Couch Potato Ghoul, someone who doesn't actually endanger their life necessarily but stops doing the mundane things which are associated with being a living creature and therefore being stranded between the boundaries of a corpse and a person.
Sleep is something fundamental to animals so I could see someone in the extremes of insomnia finding Life abandoning them but Death not recognizing them and therefore they become a Ghoul.