Mercury was automatically awarded after you downloaded the update. A card didn't pop up on the screen, but you still receive the five Grimoire.
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Should I have the card on the app ? Says card not acquired
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You're right. I didn't check first. It was only awarded to Guardians who already had the Mercury ghost fragment. You didn't have it before the update, so you didn't automatically get the Mercury Grimoire card : (
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Oh man... what / where is that fragment ?
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Look up http://destinyghosthunter.net/ It'll show you where all the ghosts are.