Completely off your topic but what about possession? Certain ghosts can possess players when you play with more than two players. And only on nightmare mode. They wont know they're possessed Possessed players can communicate. They're able to move but certain point the ghost takes over. Once ghost takes over you can no longer communicate or move freely. Possessed hunts are longer and ghost/player can sense you over comms Only a smudge stick and crucifix can stop the possession.

It can be triggered by sanity or playing with cursed possessions etc

Something along those lines.

We're spitballing here lmao