At the start of TTK we see the Harbingers being used against the dreadnought (as far as I'm aware) and they did nothing. Yet the Hull Breach playable area exists because the Cabal apparently crashed a ship into it. So how did a ship make a humongous hole in the Dreadnought when the Harbingers did nothing ?
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I always though the harbingers were some crazy secret ships, not actual energy things