Players may start to Dungeon Party (DP) in Palmir Plateau (PP) at lvl 80, but can still DP in Crystal Valley; it should be noted that Alien Brain room in Crystal Valley dungeon has mobs up to lvl90 and a fast-respawn rate to the extent that an early-mid R4 DP (80-85) may often get more experience and drops for the same length of time they would have spent in PP. Unfortunately Alien Brain (AB) room is located right at the back of Crystal Valley dungeon which deters many players. In Palmir Plateau, you will have to deal with the Gates if you want to move in the dungeon.