I am Crucible Rank 3 and counting, and now everything from the Quartermaster is available along with the overly dramatic Titan guy with all the armor. I don't know what to buy...any help/suggestions?
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Spend some of them! You'll likely gain more crucible marks before TTK. The wisest investment is to buy some planet materials. Personally, I buy Relic Iron as I don't tend to do a lot of activities on Mars anymore. So I'd say spend 50 CM on Relic Iron, you'll get those 50 back before TTK.