I personally would love an in-game mini game. A card based game like gwent in witcher would be cool. Or a custom designed small strategic board game would be cool too. Like a small board game of "go". I think it would be fun to have a lounge in the tower play other randoms. At an actual table showing our characters. Include gambling. Not weapons or armor. Glimmer, motes, coins perhaps. Not sure on the proper currency. It would even be fun to make it a mobile app. I imagine playing a few games while on my lunch break on my phone. Logging into the game in the evening to buy a new legendary gun with the marks I won. Of course I wouldn't want this system to break balance of the game... Sound like a good addition to destiny?? (Imagine a bonus game against variks. Reward, a special key to a new room in the prison.. something small but interesting)