Krakia?

Since I don't remember the Masterian storyline perfectly I'm going to go out on a limb. Prepared for corrections or pointing-outs of flaws.

Result of Over-Excitement

 Spoiler

I know Nexon America can't pull it off but it'd be amazing to have normal Masteria and how it is and once you complete Cool As Ice and then maybe a few new quests, maybe where Foxwitt finds traces of enemy attacks on the jungle area and you investigate, a special cutscene happens. Like those with Aran, Evan, and such. A cutscene shows the invading of monsters and then all of the Masteria maps change. Where, taking the idea Takebacker wrote, monsters in old Masteria maps get replaced. You have to take out so many of certain monsters and find out what the cause of this is before you chase the Alchemist back to his hidden base in Versal.

Then you get a speech about how his plans in Krakia are going well and he decided to try to free Naricain, who was sealed away by Crimsonheart in a great fight. However, the warrior was killed in the battle also and was buried where the Mesogears currently are. The Twisted Grandmasters had wanted to revive Crimsonheart to unseal Naricain, who was trapped back in Versal, as it was the creator of Olde Sappe who sealed him away and would know how to undo such a seal, even if in some sort of restored state. Which would explain the invasion into NLC.

Whatever Nexon America has planned has stirred some excitement here. Just getting my hopes up, ahaha...