If you have a look at your codes section on the profile, you'll see the cards are just Grimoire entries.
English
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https://www.youtube.com/watch?v=SHr1iBwjevU&list=UUkmAjbIecTIjTQctolYeuDw Here are the bonuses players get with Grimoire Cards
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I'm pretty sure they stated that our characters will get some kind of bonuses from Grimoire Cards tho.
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Was hoping for more :[ Oh well....