At Level 20, you will be able to go to Lost City to continue your quests; choose Quest > Perfect World at a Teleport Master or choose Glorious Return at Sekron Shien, Coldgrin Stone, Lerne Feyan, Lok Eosin, Wu Izen, Colormask, Senior Scribe, Shawle, Heartmark, Celestial Immortal, Fearen or Len Zweito get there. The teleport at 20 used to be to Archosaur, from the home city.