What will happen after the black mage?

It's not hard to introduce a "greater evil" into the mix. Look at WoW. At the end of W3, you had King Arthas fusing with the Ner'zhul as the Lich King and he became the strongest, evilest thing ever...and stayed that way for years as they released WoW and the first expansion, and wasn't defeated until the second expansion came out. But now with Cataclysm coming out, they're bringing back pineappleing Deathwing from W2, who has apparently gotten much stronger in the years while everyone forgot about him. And who knows? In a fourth expansion, they could bring back something else and call it the new greatest evil.

Was there even a mention of a Black Magician in the early days of MapleStory? I don't seem to recall hearing anything about such an entity until around when 4th job was coming out. I'm pretty sure there was a time when Zakum was THE ultimate boss...forever.