#void entity

Wendy on the other hand still has her other emotions, they're just stuck with her original body. So if she was in a situation were she would feel sad or happy (Realizes what she's doing is wrong and would be upset for agreeing, or at the beginning when she's having the thrill of the hunt) the emotions would be "felt out" but in her original body, resulting in random bursts of hysterical emotion on the parasite's end and a bone-chilling constant rage from Wendy.

There is actually a third, much BIGGER version of the void demon, which acts uhh sort of like a titan from aot. I actually have a sketch from my war! animation that p accurately shows it i think .

So there would be three hosts, Wendy, in charge of just causing chaos and killing people, the "Parasite", using Wendy's body, and the "Void", which is a manifestation of all the mass left over from the void turned into a monster dead-set on destroying the school.

The possession would last a few hours, Lovecraft fighting the parasite while the other two just sorta run rampant. Instead of lovecraft being stuck in the book, Viviana is, so the spell keeping students inside the school is sort of stuck being up until she gets out. As promised, a lot more monster-in-a-maze vibes! Wendy hunting prey and, not quite killing, but certainly getting revenge on those who "mocked her". She can't be reasoned with in this state.

There would be a bit of a plot about which host has the book (like ep2 with the amulet) with Rev most likely thinking that the parasite has it, then the big guy, until discovering it was stuck with Wendy, and insert big apology scene where he gets some character development but still acknowledges that she took it too far, some "you can fix this" esc stuff maybe. He can be the hero but at the end of the day it is still up to her whether she changes or not.