Lvl 10 - 12 Orc Base Camp (Blizzard Plains)
Lvl 12 - 14 Forest Sanctuary (Gray Ruins)
Lvl 14 - 16 Raider's Ambush Den (Cristal Stream) / Sleeper's Temple (Lower Ridge)
Lvl 16 - 18 Catacomb Halls (Wind Forest)
Lvl 18 - 20 Dark Tower Magic Institute (Blizzard Plains)
Lvl 20 - 22 Road of No Return (Cristal Stream)
Lvl 22 - 24 Prayer's Heaven (Lower Ridge)