Agreed there not native and one thing they dont kill the local organisms probably because how strong those beasts or my theory
I think that there's a massive sentient spore on this planet that releases waves with the air fungi and there's a pheromone in the air that makes thing go along with other afflicted species.
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I'll have the new troops scout for it
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A greed but some deity's name bless them if they make it One thing is that massive spore could have been keeping the planet alive or keep it in order