Falling Guardians
At the base of the Tower is a fenced off area. The many signs posted on the fence do nothing to dissuade the usual pack of children hanging around the fence, ducking their heads whenever an adult passed. The adults in question just sigh and pretend not to notice the scrawnier of the children slip through a hole in the chainlink, dash madly up to the Tower, slap its wall, and run back. They also pretend not to notice the glimmer that changes hands when the child squirms back through the fence unharmed.
This was the place where Guradians fell from the sky. They came barreling down from above, laughing or swearing right up until the moment they hit the ground. Their bodies only stayed there for a moment before dissolving out of existence, presumably back to the top of the Tower and their Ghosts.
If, when they first see the body approaching from above, a child was able to accurately predict the class of the falling Guardian, whether or not they would be falling again within the next few minutes, or how many Guardians would fall over a specific period of time they could win a respectable sum.
Once, and only once, an unfortunate child who had succumbed to the pressure of his peers was nearly smashed to bits under a falling Hunter. The Hunter managed to jump in mid air just above the child's head and pitched forward into the fence, but the child escaped unharmed. That sparked a lively debate over whether or not that counted as a completed run, seeing as how he did touch the wall, but came very close to not making it out alive.
Because of this there can be found a tablet concealed under an inconspicuous pile of rocks detailing the exact rules of the game. Veterans of the game show the newcomers where the tablet resides and thus the tradition is passed down through generations.
Parents had their suspicions of where their children spent their free time, but never said anything. Afterall, they won their fair share of glimmer through those very same bets.
~ASDFGHJKL~
Inspired by a glorious Tumblr post post/145124026367/i-just-realized (I can't get it to work as a link so if anyone else has been able to do that please tell me how) I think there's actually like a forest at the base of the Tower, but this is more fun. I'm also definitely open to suggestions for this so if you have any ideas drop a review or pm me!