Hi all. 
As everybody knows, lot of us got a bucket of shards, energy, coins. So. 
Why not to make a gamble in tower? Like a slot machine. It will give you a chance to win strange coins, legendary and exotic engrams , exotic weapon. 
Make a bet by placing special gamble coin. 
Coin price could be - 10 shards or energy, 5 radiant shards or energy, 1 strange coin. 
How is it?
						
					
					
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	Its a teen rated game, gambling is probably a bad idea (even if its just virtual). Rng is already gambling and addictive enough. Mini games with a chance at a reward (an invaders-like game with your own equipped ship for example) to kill time while waiting in the tower, would get my vote