In the setting of Douluo Dalu, the level division of soul masters is usually as follows:
Level 1.1 To Level 10: Soul Warrior
2. Level 11 to 20: Soul Master
3. Level 21 to Level 30: Great Soul Master
4. Level 31 to Level 40: Soul Master
5. Level 41 to Level 50: Soul Sect
6. Level 51 to Level 60: Soul King
7. Level 61 to 70: Soul Emperor
8. Level 71 to 80: Soul Saint
9. Level 81 to Level 90: Contra
Level 10.91 And above: Titled Douluo
Each level is further divided into four stages: beginner, intermediate, advanced and peak. In this system, soul masters improve their strength by absorbing soul rings. Each level requires corresponding soul rings to break through bottlenecks. The color of the soul ring represents its age and strength, from low to high: hundred years (yellow), thousand years (purple), ten thousand years (black) and one hundred thousand years (red). Soul masters usually hunt soul beasts in the soul beast forest to obtain soul rings.
In your story, Su Qing is a soul master, and her level and strength can be reflected through her actions and combat performance. As the story develops, she and Lin Yi can encounter opponents of various levels during their journey, which promotes their continuous progress and growth. Hope this information is helpful! If you need further guidance or want to explore other aspects of the story, please feel free to let me know.