Mutants

Mutants are creatures who were foolish enough to enter radioactive or infected areas causing mostly physical abnormalities like unbalanced limb growth, large amount of skin growth, etc, the worse it can do is, mental damage which is sadly common but on the good side you might have a chance to gain strange perks like fast reflects or being unable to feel pain. There are many mutant types but some can have more than one typing.

Type A — Devils sanity
These mutations make the creature become cannibalistic and growing a keen scent for certain body parts like skin or blood, they aren't mindless and still feel the same things they did when they weren't a mutant, but they still will crave the flesh of their brothers and their instincts will kick in and control their mind.

Type B — Clumps.
After their infected they will feel sick and would usually go through intense amount of pain, having their skin loosen and wrinkle as their body become monster like with some growing elongated body parts like an overly large arm or bones ripping threw their skin and forming spikes. Luckily some figured certain plants evolved a chemical that resets the DNA of the host and if extracted and put into your system you will be cured, but the plants are becoming endangered and you only have a certain amount of time before the chemical runs out and you become a clump again. And if you take too much, you see illusions from the past.

Type C — Abnormalz
These mutants have powers that make you require a lot of food and water than the average human, giving you strange powers like better vision or an immunity to fire or poison. Some even stranger powers like vomiting out gasoline, having an extra limb or spikes growing from your body and many more.