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Virus bombs were used on [[Isstvan III]] at the start of the [[Horus Heresy]] by [[Horus]] to destroy the [[Space Marines]] who remained loyal to the [[Emperor]].{{Fn|1}} Virus bombs were used to execute exterminatus as late as 273.M41 on the [[Stalinvast]] hive world.{{Fn|3}}

Virus bombs were used to execute exterminatus as late as 273.M41 on the [[Stalinvast]] hive world.{{Fn|3}} The '''Life-Eater Virus''', as used on Isstvan III and Stalinvast, is terrifyingly voracious, capable of spreading across the entire surface of a planet in a matter of minutes. The virus can penetrate power armour and rebreathers. The virus quickly rots and breaks down anything of biological origin, reducing it to sludge. Jungles and forests quickly rot into lakes of sludge. The rapid breakdown of organic matter releases tremendous amounts of flammable gas. The gas eventually ignites, either on its own or with the intentional insertion of an incendiary device, into an apocalyptic, planet-wide firestorm, searing the planet's entire surface to bare rock, as well as burning the atmosphere of all oxygen.{{Fn|1,2,3}}