hiding in the dark [Wall Dweller]

The Leth Vand Zone is an anomalous zone located between the Atlantic and Arctic Oceans off the coasts of Norway and the British Isles, in a previously unknown deep-sea trench at a depth of approximately 80,000 pinnacles, or 20 kilometers, in the Norwegian Sea. This zone is twice as deep as the Mariana Trench, making it the deepest point on Earth in the Pressure universe. Urbanshade chose this location because at a depth of 63,720 pinnacles, the water pressure drops to the level of a standard swimming pool. The anomalous properties of the Leth Vand Zone allow anyone to swim in it with even minimal diving equipment due to the lack of intense pressure. However, the layer covering the pressure drop, referred to as the "Leth Vand Zone curtain," requires tremendous speed to pass safely, otherwise there is a risk of an explosion. Therefore, all Urbanshade submarines are equipped with jet and turboprop engines that propel them up to 2.3 mph so that they can easily penetrate the curtain without the risk of exploding.

location: Norwegian Sea

Notes
Only when all surviving players have left the room will the Wall Dwellers emerge from their hiding places.
Wall dwellers can be noticed if you look closely at the walls: they disrupt the structure of the material and have a barely noticeable outline.
If you hide in a closet and the Wall Dweller catches up with you, it will stand outside the closet until you exit, after which it will kill you.
In "Dead" mode, you can see an orange version of the player's footsteps, indicating the presence of a Wall Dweller.
The chance of a room containing a Wall Dweller appearing as the next room is 1/62.
Wall dwellers behave identically on the Crest, but pose a much lesser threat due to the high prevalence of The Angler and its variants.
The Wall Dweller can be detected by the sound of footsteps similar to the player's (note that its footsteps are not identical to the player's), so if the player, for example, opens drawers and stands still but continues to hear footsteps, they should be aware that a Wall Dweller is following them and turn around immediately to avoid being killed.
Wall dwellers make a distinct sound when they emerge from the wall or retreat.
After being eaten, the Corpse Eater will regenerate 1 health every ~7.5 seconds upon death.
The Deformed Corpse Eater was added in the Friendly Fire update.
Rotten coral scavengers are easier to spot in a wall, as the part of the coral they spawn in should be flat.
They appear because someone lived in a vat with walls.
Wall dwellers may return a second time after being spotted. Players must remain vigilant for several rooms to avoid being caught off guard by the wall dwellers.
In very rare cases, wall dwellers emerge mutated with flesh. This occurs in the same way as mutation via rotten coral, but only in the Flesh Mines.
By eating the flesh of a Wall Dweller, you will become immune to attacks from Luminaries and possibly other monsters.

Appearance
Wall dwellers appear as monsters with long, pointed limbs and a huge, gaping maw that takes up most of their body. Three rows of teeth line the sides of the maw. The creature resembles two walls welded to its arms. They have neither ears nor eyes, likely indicating that they track prey using vibrations.
Mechanics
A Wall Dweller silently emerges from the walls or floor behind players and slowly approaches them as soon as they open the door to the next room. When close enough, the Wall Dweller places two pieces of its wall in front of the player(s), blocking their path. If it reaches a player undetected, it will devour them whole. It can be stopped by being looked at, and if you stare at it long enough or approach it while being looked at, it will flee, so checking your back frequently is recommended. The new Wall Dwellers cannot be fought, although they could previously be defeated when they attacked another player (unconfirmed, they may still be defeated). If a Wall Dweller is killed by a Knot Monster or shot by a triggered turret, it will drop a piece of edible flesh called a "Wall Dweller Piece."

Sebastian can also offer a denizen piece on his tail for 400 research points. After eating this denizen piece, the player will say "Yummers," their health bar will turn yellow (it was purple before the Four Point Five update), and they will then gain a passive healing effect similar to the Party Special.