Think about it for a sec, the tower has never heard nor have fought the red legion but only through rumors.
And during the mission "An Outbound Signal", you try to stop the cabal from sending a signal to cabal 'outside the system'
What are your thoughts? 😕
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In Outbound Signal and the grimoires relating to it we are told that the message was sent to wherever the emperor and the main forces of the empire were located. The Red Legion was how the emperor responded to the message