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Unutterable Difficulty

Unutterable is the 9th difficulty level and one step above pandemonium (contains realism aswell).

Things that have been changed:

-non headshots deal little damage
-nearly all infected have greatly increased health
-the tank has now 18000 hp instead of 8000
-commons one hit the player
-max health is 24
-friendlyfire deals massive damage
-black and white after 1 incap
-most infected are much faster
-increased spawnrates
-some other small changes that are not worth writing them down seperately

This is where it really gets brutally hard. If you do not already know what you are dealing with, i recommend trying the lower difficulty levels first.