What entities are in level 999 of the backrooms?

The backrooms is a mysterious and eerie concept that originated from a creepypasta story and has since gained popularity as a fictional horror setting. According to the mythos, the backrooms are a series of interconnected rooms and hallways that exist beyond our reality, where people can accidentally or intentionally find themselves trapped. The backrooms are said to be infinite and constantly shifting, with different levels or zones that pose various dangers and anomalies. Level 999 is often described as one of the deepest and most dangerous levels of the backrooms, and while the entities that might exist there are not explicitly defined in the original lore, here are some possible entities that could be encountered in this level, described in detail:

1. The Shadow Stalkers: These entities are humanoid shadows that lurk in the darkness of Level 999. They are described as tall, slender figures with elongated limbs and glowing red eyes. They move silently and swiftly, often appearing and disappearing without warning. They are known to be highly elusive and can teleport, making them formidable opponents. They are rumored to be former explorers who lost their sanity in the backrooms and were transformed into these malevolent beings.
2. The Whispering Wraiths: These entities are ghostly apparitions that haunt Level 999. They are said to be the souls of those who died in the backrooms and were unable to find their way out. They appear as ethereal figures, draped in tattered clothing, and emit eerie whispers that can drive explorers mad. They are known to manipulate the environment, causing rooms to change shape or disappear, leading travelers deeper into the labyrinthine halls of Level 999.
3. The Mirror Men: These entities are mysterious beings that are said to dwell in the reflective surfaces of Level 999. They are described as humanoid figures made of glass or mirrors, with smooth, featureless faces that reflect the images of those who gaze upon them. They are known to possess the ability to manipulate reflections, creating illusions and traps to confuse and ensnare explorers. They are said to be highly intelligent and manipulative, luring unsuspecting travelers into traps with their mirrored trickery.
4. The Crawling Creepers: These entities are monstrous creatures that inhabit the lower levels of Level 999. They are described as large, insect-like beings with numerous legs, sharp claws, and razor-sharp teeth. They move with lightning speed and can climb walls and ceilings, making them highly agile and difficult to escape from. They are known to be highly aggressive and territorial, attacking any intruders that venture too close to their domain. They are said to be the result of failed experiments or mutations that have taken place in the backrooms, and are feared for their ferocity and unpredictability.
5. The Watchful Watchers: These entities are enigmatic beings that are said to oversee Level 999. They are described as towering figures with multiple eyes covering their bodies, each eye glowing with an otherworldly light. They are said to possess vast knowledge of the backrooms and its mysteries, but their motives and intentions are unknown. They are known to be neutral observers, watching over the other entities and the explorers that venture into Level 999, but are also rumored to intervene and manipulate the backrooms for their own purposes.
6. The Lost Souls: These entities are tormented spirits that are trapped in Level 999. They are described as spectral figures, trapped in a perpetual state of anguish and despair. They are known to manifest as ghostly apparitions, emitting mournful cries and wails that echo through the halls of Level 999. They are said to be the souls of those who died in the backrooms and were unable to move on, forever cursed to wander the infinite halls of Level 999.