Legendary. (I could go for LASO but I'm too lazy to write a paragraph)
English
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XD What was the most detrimental tactic the the Flood used in the forerunner-flood war, and why was it so deadly?
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Taking over ships and ramming them into forerunner inhabited places
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It was actually star roads. I won't go into detail, but the books state that, since star roads were indestructible, they basically chopped the forerunner navy to bits.