The Slenderkkuri emerges. Next thing we know we'll get a YouTube series entitled Marble Marisa about how some guy just wouldn't stop poking the extradimensional oddity with a camera.
Then considering the proportion of good and bad ones, the majority would be evil spirits of evil creatures rightfully purged, so you go Dante Inferno's on their astral asses with HOLY POWAH....the very few ones remaining may be good spirits of averagely innocent creatures that need HOLY POWAH to go to heaving and shit.
Either way it stops being nightmare fuel since that scenario of Metal Gear Solid 3 wasn't nightmare fuel to begin with, as much, punch for the player.