From EpicDuel Wiki

Rating Points can be obtained through achievements. Achievements can bought from the Achievement Shop with Battle Tokens or be earned by defeating certain NPCs or performing other in-game accomplishments.

Achievements show how much rating points they are worth when you move your mouse over them.

Rating points award stars under your character's name.

Stars

If you earn enough Rating Points, you can get stars under your name. The color and number of stars depends upon your rating points. The highest rating point rank is currently the Blue Star.

1 Star: 500 - 1499 Rating Points

2 Stars: 1500 - 4999 Rating Points

3 Stars: 5000 - 14,999 Rating Points

4 Stars: 15,000 - 29,999 Rating Points

5 Stars: 30,000 - 44,999 Rating Points

6 Stars: 45,000 - 64,999 Rating Points

7 Stars: 65000 - 89,999 Rating Points

1 Blue Star: 90,000 - 114,999 Rating Points

2 Blue Stars: 115,000+ Rating Points