I have only one fully formed fictional disease. A couple of characters are infected with it and it’s classified as an ‘Extinction Level Threat’ in later books. Fun times.
It’s called Skalitzia. It’s a waterborne virus that spreads extremely quickly in conditions outside of extreme heat. It can’t spread in temperatures exceeding 89 degrees Celsius. Humid conditions hasten the spreading and severity of the virus and freezing conditions can preserve strains of the virus. It rarely mutates thanks to originating as a sentient bioweapon (fantasy reasons) It’s a terminal virus with the only cure causing intense trauma to the body so it has a low survival rate, roughly 15 percent of patients survive this.
The only cure is to remove the bodily sores before moderate symptoms begin. Upon infection the subject is given a certain amount of time to live, ranging from 3 days in ideal conditions to as little as 24 hours in the worst case scenario, giving them only 8 hours before moderate symptoms begin.
The only way to remove the bodily sores and cure the virus is to burn off the sores at a temperature exceeding 90 degrees. Or the sores can be removed with a knife.
The mild or early symptoms include:
Black, pulsating, pus-filled sores on the entire body
Dirty yellow eyes
Loss of movement or sensation in areas of the body
Intense, almost unbearable pain
Mild conditions intensifying
Mental degradation (sub-primal intelligence)
Loss of memory
Fatal Symptoms (12 hours left to live)
Absolute bodily deformation (transformation)
Complete loss of memory
Loss of articulation
Development of bodily deformities and enhanced physical characteristics. Strength, stamina and endurance.
This virus creates 3 kinds of monsters. It creates standard grunts, which are just people infected with one of 3 strains. The second strain creates what are dubbed ‘enforcers’ which are heavily armoured monsters that are nearly indestructible with human equipment. The third create ‘Apex’ monsters that serve as commanders and breeders for the lower classes. Extremely rare to find anything aside from a grunt, but the one unique ‘Creator’ variant, which is the virus incarnate, is rather easy to find due to not possessing any symptoms.
The virus has no colloquial names. You said you wanted detail, i gave it. That’s just one of the virus’ i was thinking of