Bile Bomb

The Bile bomb is a new weapon appearing in Left 4 Dead 2. The weapon was first mentioned in the new achievement list here. Not much is currently known about this weapon, except that it contains Boomer bile, which, when used, will call a horde to attack anything the bile hits.

Once you kill one of the Hazmat Infected, they may drop one of these containers full of bile due to the fact that they were CEDA workers that were studying The Infection. Despite this, they can be found outside of The Parish. The bile bomb will use the same inventory slot as the pipe bomb and the molotov

.

The bomb spreads Boomer bile on whatever it hits and the horde summoned by the Survivors will attack whatever is covered in bile, including other Infected. The HUD symbol for the Bile bomb is a bio hazard symbol. If the Bile bomb is used on an empty space, it will summon a horde and all of the local infected to the place where the bomb landed, the infected will ignore the survivors so long as the bile is still in effect making for easy targets. The Common Infected hit by the bomb will begin attacking each other, as well. The bomb can also help in tank fights as it call the horde to attack The Tank.

The bomb can also be used to confuse Special Infected as it will make any two SI which have been hit to fight one another as well as the oncoming infected this can lead to hilarious consequences so if done correctly you will see a Jockey and a Charger having a battle to the death.

Throwing the Bile bomb on a Survivor will not draw a horde to attack.

There are two achievements involving the bile bomb: Septic Tank is achieved by using the bile bomb on the tank, and Robbed Zombie requires you to pick up ten bile bombs dropped by CEDA agents you have killed.