Everything dies quickly...even you! This custom mutation makes left 4 dead 2 very unforgiving, in that if you screw up, you're very likely to die. To install simply place the .vpk file in your addons folder (C:\Program Files (x86)\Steam\SteamApps\common\Left 4 Dead 2\left4dead2\addons normally). The steam workshop version (with the full feature list) can be found here (remove spaces): steamcommunity . com / sharedfiles / filedetails / ?id=295194162.
All zombies go down in one hit, including the smokers tongue and the tank's rock, except the tank himself, who deals 3 times damage, and the witch, but you go down pretty quickly too. Common infected deal 5, 10, 25, and 100 damage at easy, normal, advanced, and expert respectively; not to mention there are a lot more of them. Special infected pounce powers (smoke, hunter pounce, jockey ride, and charge) kill you instantly if you let the specials get you. The boomer has faster vomit with higher range; he can vomit longer, and can kill you with melee in one hit if you let him get too close. The spitter has faster spit with higher range that deals double damage. If you get downed, you're dead; there is no incapacitated. Accordingly, first aid kits are replaced with defibrillators which revive to 100 health not fifty and pain pills with first aid kits. Shotguns are also automatically replaced with automatic weapons (meaning no more witch crowning, better be careful). Lucky for you, your teammates deal less damage to you: none on easy and normal, 10% and 20% the normal damage on advanced and expert respectively.
Steam workshop version (remove spaces): steamcommunity . com / sharedfiles / filedetails / ?id=295194162.