Which one would win if it came down to most infects? Personally I'd say the brain worm simply because you can't tell if someone has it or not.
Inb4everybodyvotesfloodcuzhalo
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I would say flood because it doesn't have any weaknesses while the brainworm is weak to cold. But the brain worm can't be recognized if has a host.
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flood cuz halo
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Flood cuz precursors