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'''Exterminatus extremis'''{{Fn|3}} is the obliteration of a world's entire population through some form of weapon used from orbit or nearby space.

Exterminatus is essentially one of the many tools in the armoury of the [[Imperium]], used in those cases where complete destruction is deemed a better solution than more subvert or conventional methods. The world in question may have fallen to [[Chaos]] worship, or its Imperial government overthrown and replaced by the rule of aliens such as [[Genestealer]]s, or it may be a non-Imperial world harbouring an extraordinarily powerful and dangerous species of alien. Exterminatus is often resorted to when the world is deemed to be not worth the amount of men and material that would be required to conquer or reclaim it. Exterminatus is very rarely used on planets vital or valuable to the Imperium. It has also been used as a method of denying resources to alien invasion.{{Fn|5}}