REQ system was explained a bit recently. 343 Industries planning on having around 1,000 unique digital cards available at launch for the feature with more added over time.
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Halo 5: Guardians will use digital cards to dole out weapons, armors, vehicles, animations, boosts and other unlockable items in multiplayer. We've known as much. But in a blog post this week, 343 Industries spoke about this Requisition system (REQ for short) in greater detail.
By playing in Arena or Warzone, you'll accrue points that can be spent on card packs. These packs will also optionally be available for purchase using real-world money, with a portion of proceeds going toward the Halo World Championship prize pool. Cards vary in rarity, of course. Some are single-use, some are permanent. Only cosmetic items can be used in Arena multiplayer.
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http://www.destructoid.com/halo-5-s-...s-311421.phtml