It seems people who run the Easter egg on yesterday's daily and recovered the ghost shell from the chest in the portal have activated this mission so if you have not got the last firewall mission I'm assuming this is how you start it
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#Destiny
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I didnt do that and i have it. So no. You need 4 of the fusion relics and have to turn them in.
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Isn't it "The First Firewall" If so, I didn't do the daily yesterday and still completed the mission, de-coded the the thing, went to the Devils Spire, and reconstructed the core.
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The last firewall is for Sleeper Simulant, unlocked by turning in the 4 DVALIN fusion rifles