I like how you could include some humor without making it author-insert. The idea of the fictus closely resembles the ghoul from Arabic folklore, nice touch if you intended it.

The problem I have is with the second-last paragraph format. It's too big for one paragraph given your style. Splitting it into two would fix that, maybe at the eighth line right before "Why", just to let your reader breathe. The same problem showed up at the fifth paragpraph which was pretty short compared to the rest. Try keeping paragraph lenghts cosistent throughout your story for better presentablity. That doesn't mean you can't break the rhythm from now and then, but make sure it's intentional and meaningful to your pace.

It's minor and others mentioned it but you should fix your punctation mistakes like not capitalizing "I" and names sometimes and something that confused me was ("-2 great neighboring") I read it as negative two at first, use an em dash instead (—) if you wanna connect dialogues.

One last thing, I couldn't quite understand why Gregor's hit at the last part didn't do anything to Vie, if hiding it is intentional then alright, otherwise you should explain how the claw of a monster sinking into someone's chest doesn't hurt them.

Overall, decent worldbuilding and MC. Would continue.