[CujoEX]

L3O~35 = Partusay or Kamiki
L35~4O = Kamiki, Gardosan, or Cyclopse
L4O~5O = Dark Anmon

At the moment, Xenia Border is the highest map you can go, however, Battle of Bermesiah gives more EXP than Xenia Border, so I suggest staying in Battle of Bermesiah until a new map releases.