An Enemy Stronger than the Black Mage?

Yep. They're setting up a storyline for after the Black Mage.

.....Which is disappointing, because I was kind of hoping the fall of the Black Mage would mean Maple Story is ending, so they can release Maple Story 2.

Because, let's face it. The MS client is too old, too outdated. It doesn't really allow for things other than grinding, those horrible jump quests, and pay2win bosses that are only "hard" because of 1/1 spam and requiring tons of DPS in order to kill them in time.