You ran from the village you called home. Gruesome creatures with fleshy bodies and worm-like organisms sprouting out of them attacked your village, turning everybody into those same monsters. You were probably the only survivor.
You ran away as far as you could, until you stopped. Exhausted, you mined some wood to make a campfire to rest for the night. You cooked some meat to rejuvenate your health/hunger when all of a sudden, a distorted teleportation noise emitted from a distance.
Shit.
You quickly made a makeshift weapon, and prepared yourself. An enderman appeared, but the parasites had gotten to it, turning it into a twisted, unnatural, and dislocated version of itself. Its eyes weren't present, and lumps of flesh were on its body. Its arms turned into scythe-like arms that looked like a praying mantis' arms, and it was twitching and shaking uncontrollably as it emitted a loud screech and ran towards you erratically.