Night Hunters: Source. 

 While searching through a post industrial disaster area for a genetically altered trooper, code named 'Predator', a creature that is bigger, stronger, faster, and better quipped for combat. You start to realize that you are the one being hunted, watching as you squad is taken down one by one, frenzy and panic start to take hold amongst the Marines operating in the dark.

 Though there are many mods out there that challange the player to fight against everyone else, this is one that boasts intensity. Night Hunters, will be terrifying team deathmatch mod in which ther're no lights at all, and what light you get comes with a heavy price.