What will happen after the black mage?

Nonsense. Of course the ending is a game over screen with credits of Nexon employee's names disguised so you can't track their real-life counterparts. That and after all the credits, a message appears with the amount of hours it took the level that character to 200 and defeat the final boss. It is then, and only then that everyone will realize how much time they could have saved. Really though, they just lowered Zakum's level in Big Bang, what's to say that the same won't happen to the others to make room for new bosses? We may never fight the Black Mage or have to wait at least another three years. There is a lot of background story that Nexon has developed, but not much released about the Black Mage. We know he exists, and that's really it. Cygnus know about it, but only fought minions. Aran was frozen in ice by the Black Mage (or something) and still just fights the minions. It's been a while since I've bothered with Evan, but I think it's the same. In fact, you don't even fight the Black Mage at Dragonrider PQ, it's a fake. Big Bang might bring at least the start of the Black Mage hunt to the Adventurer's story, and even though we're only 2-3 months off of KMS right now, you have to realize that Masteria, CWK, Singapore, and Malaysia aren't in KMS (at least not the same CWK). There's a lot of stuff on our end that Nexon needs to fix up and make sure works. We may even see Bigfoot die off as a viable source of exp if it gets revamped. If it doesn't, everyone will be at Bigfoot as the best source. The point is, there may not be an end, just like nearly every MMO. If you kill a god in an RPG, you just go to another galaxy and kill another.