There needs to be a much better way to get Neomuna Red Borders other than playing Russian Roulette with Heroic Patrols
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Run the weekly story mission. Gurenteed red border on 1st clear of the week. On a knockout system. Both weekly vendors' powerful engrams can drop as red borders to. As well as vendor rank ups. Also, get a red border for hand cannon and fusion from the campaign. Run your alts through