A linear build tester.
Okay so the way this game works is your RPG party chops its way through a set number of fights until it gets to a **BOSS FIGHT** and then you get to find out if you've built your party correctly to beat the boss! But if you can't, then you can't, because you've fought all the fights you're gonna fight and gotten all the gold you're going to get and there's no going back to, idk, level another time to take another shot like you would in most RPGs, so you get to rebuild your group from the very beginning. Fun! ^_^