This is ABC Inferno one of the most hard to find mods and one of the most unique experiences. This will make the game unbelievably hard for you, because of some of the strange events that can happen within the zone. It heavily changes the game and adds in several new features. I would highly recommend this for people looking for a challenge or a very dark and gritty S.T.A.L.K.E.R. experience within the zone.