So basically if you've handed in the 4 fusion rifle parts, next time you hop on for destiny you should have the 'first firewall' mission available on earth for you to then get the IKELOS fusion core?
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Turned those in the first week. It appears that doing the side quest in yesterday's paradox daily triggered the mission
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Complete first firewall mission , enter codes into curious tranciever, do next mission shadowcall on a time run to top open chest kill the 3 wizards you now have fusion core :)