After all your base stats have been established you will have the choice during any time, to upgrade your Duel Avatar. Each Duel Avatar has a set of base stats for their Attack, Defense, Speed, Dexterity, and Intelligence, which can be upgraded at the cost of Burst Points. You can buy a Stat Point to increase your Duel Avatar's stats and overall effectiveness in combat. One Stat Point costs 200 Burst Points, which you can buy in the Duel Avatar Shop and can be assigned to any of your stats. You can also upgrade your Duel Avatar's current level as well, but will cost you your next Level x 100 in Burst Points, plus a small upgrade fee of 100 Burst Points. In order to upgrade your Duel Avatar's Level you must defeat 5 of the same level opponents as you. If you fight higher level opponents this decreases the number of wins necessary. For example if you are Level 1 trying to get to Level 2, you need to beat five Level 1 opponents or beat a Level 2 opponent and three Level 1's. A higher Level opponent reduces the number of wins based on the difference between your Levels.

A couple small example:

Purchasing 5 Stat Points will cost 1000 Burst Points

Level 5 moving on to Level 6 will cost 600 Burst Points plus 100 Burst Points, a total of 700 Burst Points.