Would guardians have a better edge than the N7 troops and allies?
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I'm not quite sure how they'd handle an actual invasion. Guardians would easily handle the hordes of husk. Banshee, Brutes and other Reaper conversions wouldn't pose that much of a threat when you consider the Vex and the Hive. The actual Reaper ships would prove to be an issue I'm not sure they could overcome.