Leveling up is how you measure your character's growth in 9Dragons. Every time you perform a quest or win a battle you gain some Experience. At certain points you are rewarded for this growth in Experience by attaining a new level, also called a "Cheng".
There are currently 18 major levels to advance through. Each major level has 12 minor levels (or Cheng) within it. At the start of every major level you must demonstrate new mastery of your Chi Breathing technique to advance. These are the 18 levels of Cheng you may attain on your road to The Dragon:
Level 0 None
Level 1 Losing Self
Level 2 Gathering Chi
Level 3 Opening Chi
Level 4 Revolving Chakra
Level 5 Raising Light
Level 6 Five Dragons
Level 7 Sun and Moon
Level 8 Golden Blossoms
Level 9 Elemental Crown
Level 10 Floral Crown
Level 11 Crimson Snake
Level 12 Golden Lotus
Level 13 Humble Master
Level 14 Little Master
Level 15 Hermit
Level 16 Projected Soul
Level 17 Dissolved Body
Level 18 Immortal
Level 19 Heaven's Gate
Level 20 Heavenly Immortal