The idea is adding reward mile stones to the experience bar , encouraging players to play even more to reach that milestone for the reward
500 000 EXP : 1 ultra mythical box
1 000 000 EXP : 2 Ultra mythical boxes
2 000 000 EXP : 3 Ultra mythical boxes
This encourage F2P players to play even more if they havent have enough myths or certain items to reach make a proper mech , what do you think ?