source url MapleStory’s v.148 update patch introduces the Grand Athenaeum dungeon. In here players can participate in “Episodes” that offer challenges for MapleStory items and MapleStory Mesos rewards.
How MapleStory Mesos Fans can access the great library
Access to the dungeon is limited to characters on a MapleStory account that are level 100 or higher. Players need to take the quest on the left of the game window named “[Grand Athenaeum] Visit the Library.” Using the Dimensional Mirror will then move them to the dungeon to look for items and MapleStory Mesos.
MapleStory Mesos and item rewards
Characters that complete the various episodes can get different equipment, specifically medals that boost various stats. A Mastery Book 20 and two Bonus Pendant Slots can be obtained. Unfortunately, all items are untradeable so they cannot be sold for MapleStory Mesos.