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

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.

This actually brings me to another point.
What exactly is stopping us from killing the Black Mage right now? It took 5 heroes to defeat him before, as there were no other adventurers. Now we have the main force (Explorers) the back up (Cygnus Knights) the reinforcements (Resistance) AND the original Legends and descendants, Plus the fact that the Black Mage is still weak and mostly sealed (as far as i'm aware)