Youtuber and modder Cosmic Contrarian is at it again. Contrarian is known for creating massive battles within Fallout 4, like this one we covered back in November where they pitted every legendary creature in the game against one another.
The latest video says it has 20,000 Demon Deathclaws facing off against a fort filled to the brim with Brotherhood Of Steel soldiers. It's a heck of a spectacle, even if the framerate (understandably) chugs in some places; you can watch the whole thing right here:
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You can find the rest of Cosmic Contrarian's constructed battles here.