Seems like they're preparing a new part of Time Temple.

 Spoiler

The Black Mage founded the town of Magatia in the hopes of using both kinds of Alchemy to achieve immortality, as far as i'm aware, it failed and he disappeared, but his experiments lie buried underneath Magatia in a secret room (which you can enter)

I think thats right at least, its been a while since i did those quests.

I could swear I saw that he achieved it, and that's when all hell broke loose in Maple Story, with the Black Mage having immortality by his side, and lack of adventurers other than the 5 heroes. Going to re-do the quests it seems.