I agree with other guy. Ghost shells are rare and a holding me back. That apple of discord isn't that great man.
How do you get legendary marks reliably anyways. I only seem to get them from quest rewards.
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Heroic strikes and running the daily's are a very reliable way
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Is there a weekly limit on marks given from heroics?
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You can hold only 200 at a time but there's no limit on how many you can earn per week. No weekly limit on heroics that I know of, I think you can run them as much as you want
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Limited to 3 times a week, so very limited.