The general idea is that this SCP is a type of fungi that on closer inspection, appears to be constructed of human nerve cells (specific biology is still to be ironed out). It is a species of fungi all on its own, and has different sexes; it is able to reproduce. It is also able to be cloned like regular mycelium. Spores are found to enclose some type of amniotic fluid.
This SCP is dangerous due to what it does when its spores are inhaled by immunocompromised animals. It effectively destroys peripheral nervous tissue in its host causing allodynia and symptoms associated with Guillain-Barré Syndrome. As this nervous tissue is destroyed, it builds up its own nervous tissue, effectively re-purposing the body when it reaches the brain and creating a completely new individual with new perceptions of the world. At a point, the original individual's brain may still be conscious of everything that is happening, but is unable to move their body from the neck-down. However, their body would still be working (due to the SCP's neural matter taking over functions) and would then be taken over painstakingly. I believe that's where the horror could lie if it is written correctly.
The first instance of the SCP was discovered after a terminal patient (who happened to forage mushrooms, knowledge given by the family of the patient) eventually woke up, with the identity of a completely different person. I don't know if this new individual will be anomalous in terms of their behavior, but they may want to keep spreading the spores…? I'm still figuring that one out.
I also am unsure if this SCP is either Safe or Keter, due to the fact spores are the hardest to get rid of due to their micrometer scale and hardiness. It's Safe in containment, but there are too many instances of it to know if it truly has been contained completely. Perhaps the containment procedures regard a certain area of land it is known to grow in?
This SCP was brainstormed with reference to how a human's nervous system bears resemblance to dead branches; and how mycelium also happens to be similar to them as well.










