Extradimebiota is a unusual organisms on [PNF-404], these organisms descendant from unidentified biological dark matter.
Many conspiracy theorists speculate that they're originated from an undiscovered extra-dimensional alien planet or ectoplasma (ghosts) of dead organisms into gelatinous beings. When researchers were discovered, they were thought to be just an unusual amoeba, but later genetic research revealed that they were not amoebas for obvious reasons. Like viruses, their evolutionary history are still yet unsolved.
The Key is a wraith species currently found on somewhere on middle Proxima desert. This species usually has transparent body, has tentacles and has parasitic lifestyle. Also it is very importantly to study for the evolutionary origin of Ambuloradiciopses (Pikmin incl.) and Ambulomycetinæ (Puffstool incl.), which both unrelated groups are actually sybiogenesis result of the key. The key usually parasiting towards plants and fungi and uses as "suit" due to unknown reason.
Waterwraiths (Anthroplasma sapiens) are 112㎜ sized cryptid that usually habits on dark submerged caverns, with a transparent, watery thick viscous body and use their made-own roller rocks as vehicle. Waterwraiths are popular cryptid species among with cultures of castaways & travelers since 2004 (hocotate year), which led into a subculture. Their unique roller rocks are actually made of basalt rocks with nickel and cobalt. However, how these organisms make these rocks are still yet unknown.
Scientific skeptics suggest that Waterwraith doesn't exists but rather a pseudoscience, collection of some expressions such as fear & mental disorders such as schizophrenia or delusional disorder. However, there's many peoples who believe it or enthusiasts suggest some "evidence" such as images, videos and encounter reports, which many of them were confirmed as hoax.
Plasm Wraiths are 245㎜ sized cryptid that usually lives on somewhere on Neoaurunica (insular continent of Medithalassa); especially wood houses made by termite colonies, with a golden thick venus body with two legs, one hole on torso with unknown proprieties & hard cubic "core". Sometimes they can shift into goolix-like shape or whatever. The problem is that Neoaurunica is extremely drier & arid, which is very hard to find them.
Rumors said that they kidnap castaways including Captain Olimar due to their curiosity. Some suggest that they're actually sapient beings but very lonely due to harsh chaotic environment of Neoaurunica.
Like Waterwraiths, It is also confirmed as a hoax, pseudoscience & collection of some expressions & mental disorders but many peoples believes it.