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Wonder how this battle will go. The full Mitu Conglomerate is likely beyond our reach, it taking three full strength Astartes legions, multiple Auxilia fleets, numerous exterminatus grade muntions. The Mitus ships were very powerful, utilizing powerful energy weapons from their organic ships manipulated by psychic thought, often coming down to brutal boarding actions as much as space gunfights.
I imagine we'll have to fend off a fleet with all the planets we've amassed thus far. If we can buy time for the Nullstone Fortress to come online (and if Lucius has been also up gunning it with turrets and such) we could have a key tool in fighting them.