Editing Exterminatus (section)

===Virus Bombs===
Virus Bombs are warheads loaded with the Life Eater virus, a biological payload that causes all living tissue to super-quickly rot and decompose (which gives Nurgle a massive boner). The bombs are designed to release their payload mid-air, so that the aerosol form of the virus gets spread out through the atmosphere, potentially achieving [[meme|complete global saturation]] in minutes under the right conditions. This immediate rot causes a build-up of methane and other flammable gases, which in turn can be ignited by one of the lasers above (or any still smouldering Lho sticks, or any other source of flame), sweeping the area in firestorms. A relentless bombing of these fucking things is what reduced [[Tallarn]] from a verdant forest world to the desert hellhole it is now.

They were also used by [[Horus|Warmaster Horus]] to kill off loyalists in the Traitor Legions during the Istvaan Campaign of the [[Horus Heresy]] (the Life Eater virus eats through any filters and corrodes power armour till it gets to the gooey marine inside, though a Dreadnought can endure it easily if its shell isn't even slightly cracked). Though popular during the Great Crusade and the Horus Heresy, according to [[Amberley Vail]], virus bombings are rarely used in the 41st millennium, because the Inquisition has figured out that they feed the fucking [[Nurgle|Plaguefather]] every time they're used. [[Fail|Whoops]]. 

(That said, they were falling out of favour even before that: since as demonstrated on [[Armageddon]] one virus bomb usually isn't enough to kill the whole planet and you might need to hit the planet several times all around. Plus, since it's airborne, this can result in hilarious [[FAIL]] when the wind patterns disperse the virus in the wrong direction, as canonically happened with [[Herman von Strab]]'s use of them on Armageddon).