Insanities are wanderers who have undergone the sickness of insanity welding them into a creature of blood and pus. Insanities can vary widely in appearance whom they have separate categories of specimen. Insanities share an oddly similar genetic structure with Gymsanities from Level 1234. Many specimens of Insanity commonly produce oral gags or snarls with little known purpose, while some retain distorted speech, although its not known whether its actually a past self or just oral sounds produced by the stress of Insanity.
Embers of the past self are hard to discern, but visible if closely observed, one would spot personal keepsakes (e.g, clothing, tools, personal belongings), though often mutilated beyond recognition.
Mutations are frequent in Insanities, often resulting in misplaced eyes, disjointed or excess limbs, or even fleshy, skeletal "wings". A common and formidable variant manifests as a deformed mass of flesh, consisting almost entirely of eyes, mouths, and other orifices of unknown purpose.
Insanities are almost always hostile, but other than that, their behavior varies wildly. They carry weapons and tools such as firearms, grenades, melee weapons, etc. Moreover, there have been confirmed sightings of Insanities wearing tactical gear and night-vision goggles. Rarely, you will encounter a group of 5 Insanities armed with an arsenal of weaponry. This specific sighting has been confirmed by multiple Wanderers. Some Insanities will form groups whereas others will remain solitary. Some will actively hunt humans while others will choose an area to live in and only kill Wanderers who enter their area. Other entities in the backrooms tend not to hurt Insanities, sometime even forming "packs" with them.
These are the stages that a human transforming into an Insanity will pass through.
Stage 1
During stage one, a human will become insane. Symptoms of insanity can include schizophrenia, psychosis, or any known mental disorder. Almond water can usually cure them of their insanity.
Stage 2
During this stage their skin will begin to become red and raw, while other symptoms include itchiness and irritation. Almond Water can cure them but they may still have permanent scars on their skin.
Stage 3
Their body will gain further traits of insanities. Their skin and muscle tissue will begin to dissolve in an unnatural fashion, often developing orifices and pustules, sometimes developing holes in their body. They will scream in pain if they are fed almond water. Giving them enough Almond Water will usually kill them, but there have been some cases where they returned to sanity, albeit with horrible physical deformities.
Stage 4
They are a full Insanity with all of the traits of their type. They will develop a large open smile, mostly without teeth. There are rumors of a benevolent 4th stage Insanity, but these are unconfirmed.
Further Evolution
It is widely rumored that an Insanity can transform into a Gymsanity under the right conditions. There is very little information on this topic so the exact process by which this happens is unknown.
An image of a stage 4 Insanity on level 1 found