Please someone tell me what the hell they are good for and I've failed to get a straight answer from anyone. Thank you.
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Cards show (some) kill bonuses. Type of mob requires so many kills to increase their glimmer output, territories with so many kills will give extra resources. Weapon cards take ammount of kills to increase their leveling speeds. Some medals are required for bounties such as buckshot bruiser (kill threr enemys in crucible woth shotgun without dyjng or reloading)