The maximum level attainable by players is initially 50; however, every five levels from this point, Maat or the Nomad Moogle in Ru'Lude Gardens give you a task to complete to prove your worth as an adventurer and raise your level cap through to 99. These quests are sometimes called "genkai", Japanese for "limit".

These quests only need to be completed once to raise the level cap for all jobs, and can be completed on any job (with the exception of "Genkai 5", see below).

• In Defiant Challenge ("LB1" or "Genkai 1") from 50 to 55.
• Atop the Highest Mountains ("LB2" or "Genkai 2") from 55 to 60.
• Whence Blows the Wind ("LB3" or "Genkai 3") from 60 to 65.
• Riding on the Clouds ("LB4" or "Genkai 4") from 65 to 70.
• "LB5" or "Genkai 5" from 70 to 75:
  • Shattering Stars for all original Final Fantasy XI and Rise of the Zilart jobs
  • Achieving True Power for Puppetmasters
  • A Furious Finale for Dancers
  • Breaking the Bonds of Fate for Corsairs
  • Survival of the Wisest for Scholars
  • The Beast Within for Blue Mages
  • Elementary, My Dear Sylvie for Geomancers
  • Endeavoring to Awaken for Rune Fencers
• New Worlds Await ("LB6" or "Genkai 6") from 75 to 80.
• Expanding Horizons ("LB7" or "Genkai 7") from 80 to 85.
• Beyond the Stars ("LB8" or "Genkai 8") from 85 to 90.
• Dormant Powers Dislodged ("LB9" or "Genkai 9") from 90 to 95.
• Beyond Infinity ("LB10" or "Genkai 10") from 95 to 99.