Level 0: all normal humans
Level 1-2: trained human.
Level 3: break human limit
Level 5: gather energy
Level 10: Deadly Core
Level 20: Celestial Core (False God)
Level 30: Divine Core (God of low rank)
Level 40: Divine King
Level 50: Divine Emperor (middle-ranking God)
Level 60: Holy Divine
Level 70: God (God of high rank)
Level 80: True God
Level 90: Transcendent