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<I mean, if you want the two major ones, the Great Disaster and the Red War do fit well. You could also Twilight Gap due to the numbers of Guardians that fell against the combined might of three Fallen houses with the knowledge that the Wolves would've turned the tide.>
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SIVA killed a shit ton of iron lords too
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The bis ones were these two and twilight gap, six fronts and the siva crisis but there have been dozens if not hundreds of times of mass guardian death during the dark ages with the warlords and dredgen yor and stuff