Gollux

I can deal with the Chinese.

Basically you start from the refugee camp (or whatever equivalent is present in Masteria right now I think, the ninja camp or something?) to accept your first quest, then you can enter the maze from the phantom forest. You can see your entry path on the minimap everytime you enter the maze. The maze resets every 2 hours (or it probably means, you have 2 hours in the minimap else it resets and you get transported out).

There is a 10% chance that a map (I don't know if it is an individual map or the entire minimap set) will contain a boss map, which contains the boss [Very Strong Headless Warrior] (direct translation). Defeat the boss to obtain 5 Masteria Fragments. Mobs in the maze also drop these Fragments, and these Fragments can be exchanged back at the camp for the Earrings, Pendant and Badge (all level 130). [By the way, translation doesn't make it clear if it's a badge or medal, but from the stats of the equipment I'm guessing it's a badge].

Entrance to Masteria is via Dimensional Mirror... and the equipment rewards are untradable unless SoKed. Not PSoK.

No mention of entry limit.

Hadriel