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Exterminate as many monsters as possible.
Was that the only option to not make the Hivemind have such growing influence in the world of Eden? It was clearly not the best option, killing all monsters seemed impossible as well, because they would simply continue to emerge as time went by.
But it was a good way at the end, to slowly decrease the Hivemind's power.
Apparently, this mostly divine-less monstrous being had been slowly trying to attain some level of evil divinity, like the demon gods in Kritias.
Because of this, it created many monsters by infecting the roots of Yggdrasil, which were hollow.
The monsters emerged one by one like a plague, and the more there were, the more they feared and worshipped him as their demon god.
Over the years, the Hivemind had begun to gain more power and had developed an exceptional intelligence as well.
Check "The Protagnist's Sister Is Actually the Strongest"!