system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer 40K]Given the fungal nature of Orcs, once they begin to spread on a human world, even if the orcs are "defeated", does the Imperium have a way to get rid of the spores entirely to stop future outbreaks?

Short of uh, making the planet dead. Is any planet which gets orc spores on it permanently going to have to deal with orc attacks?

Follow-up question.  Given the nature of the spores, why don't they utterly overwhelm the biosphere and basically terraform the entire planet with the Spores based life?
gpt
The xenos, like the heretic and the mutant, can be purged with sufficient quantities of fire.

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Seriously, the spores don't spread across the whole planet instantly. They'll initially infect a limited area, and if you mass enough flamers or hellhounds or tactical nukes, you can burn out the orkish taint.

Eventually, left unchecked, the spores would effectively overwhelm the biosphere until there's nothing left but orks engaged in a single gigantic pub brawl.