If you are missing your level 40 crystal on your Xbox one, go to games and apps and highlight destiny (hover over it) and press the button with 3 lines (menu button) . Then press manage game and press a. Press a on the part you want to reinstall to get you Level 40 crystal.
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#Help
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i have to compliment you on wanting to help other guardians, but most of them are gamesharing (downloading the dlc their friend or relative bought) to not have to pay themself, in a small effort to stop this bungie has made it so that only the original buyers (so not sharers) get the spark of light (level 40) :)