According to your role
At EC4-EC5 you can move Liaodong but at EC7 you return to Nanchang for Phoenix Dynasty Gold. You must choose the mobs level and locations according to your role. If you are healer or hybrid you can choose yellow/orange mobs easy, if you are nuke and need slow mobs you stay at deva or bid deva kings at near the zombies and after that you can move to Beast Clan area.