Walls

Water, Earth, Fire, Air.
War, Peace, Death, Life.
Red, Blue, Green, Purple.
All vying for a chance to survive.
In the wargame Walls, if you are convicted of a crime as a minor, you don't have a chance. Innocent, guilty, small theft, mass murder. Any crime convicts you for life. The ultimate death penalty. To win, you must be the last team standing.

The red team is brutal. They are the vicious warriors.
The blue team is graceful. They are the stealthy deceiver's.
The green team is herbology. They are the ones who are more likely to poison you when you aren't looking.
The purple team is quick. They are the ones who can dodge your blows.

For Mercy, she was trying to help her family. And she was punished for it. Placed on the red team, she is forced to participate in the wargame Walls.
(description written by @Ilderith_Shurtugal )