Left For Dead

This fat and Massive boss infected can belch on players and blur their vision, as well as alerting nearby infected of the player's whereabouts. Also when shot he explodes, dealing AoE damage to all players nearby, or if he drops from a great height he can "pop" some of his boils, doing AoE damage as well.

The smoker is an infected with a long nasty tongue. He can use his tongue to pull survivors out of their group towards him, and also poisoning them in the process. He can also "tongue" enemies from above, which instead of pulling them towards him, hangs them. The only way to stop this is if another survivor sees the smoker and shoots him, interrupting his hanging. Also whenever shot or tongue-attacking the smoker lets out a a gas cloud, making it hard for survivors to see him.

The hunter is a hooded infected than can travel much faster than other infected. He also has the ability to leap great highs and scales buildings and walls. His greatest feat though is the ability to pounce onto players, knocking them down, then riving them apart piece by piece. This ability again is only stopped by another survivor either shooting the hunter or meleeing him off. The punching require the hunter to charge it first them releasing the pounce, the leap can be done at any time. The Hunter also slowly regenerates health

The tank is a massive boss infected, with one mutated arm. The tank has a massive amount of health, and is very fast. It also can knock survivors down and pummel them alive. The Tank can also throw piece of concrete or cars at the survivors and also knock down certain walls. Due to its power the tank is rarely spawned by the director, two are even more rarely used by the director to really challenge a good team.

The witch is a very powerful infected boss as well. She will sit or lay somewhere in the shadows, moaning in pain and not moving. She will not attack survivors actively; instead she will only attack if she is alerted by their presence, so when playing the survivor if you hear her moans you should be especially careful to make as little sound as possible. If you do awaken her on the other hand, she is a nasty bitch to take down. She has near to tank health, runs lightning fast and has a cool down one hit ability, which will kill any survivor in one punch, he normal melee attack is a bitch on its own too.