Obviously we can't rid of major pollinators like Honey Bees. I'd say that the top three to get rid of are: spiders, mosquitoes and...
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If they bring Bretonnia back, they'd have 4... Empire Bretonnia Kislev Cathay Dogs of War are a good mix though.
And yet I would still Thanos snap all spiders out of existence if it were in my power to do so!
Maybe the an inclusion in Total War: Warhammer might be the ticket to get them back on the table top. If they prove to be popular in the game, GW...