How to get the UR from the Box
Just a little guide on how to get the UR from the Box. To do it, you need to follow three steps:
1. Have atleast 100 MJ saved (100 for each UR you want).
2. Play the event. Something that works well is attacking LRBs - you get 80 - 100 Ruby Gems for each Boss, and the points aren't bad either.
3. Use your Gems until all the SR and R are gone from the Box. Then use 100 MJ and the UR is yours. Repeat step 2 if you want more than one UR. This requires quite some time and/ or Battle Potions though.