“An ordinary zombie is slow, dull and dangerous only for an unarmed and confused person in a confined space. These zombies are called “sleepy” zombies. Anyone who has tasted any meat becomes smarter, faster and poses a problem even for the living who wield weapons. These nimble zombies are called “awakened”. But the worst of all are those of the wights who were able to get to the living, unconverted meat of an individual of their own species. They change even externally, acquiring new capabilities, their intelligence increases, but all this: power, speed, cunning - is used only to kill the living. The resulting samples after morphing - they are called "necromorphs" - are extremely dangerous and can only be neutralized by special groups authorized by management for such work..." Textbook "Basics of Life Safety" (section "Zombology", chapter 1) "But surviving people who have lost their humanity in itself, more terrible than any morph. Remember this, children."