KMST 1.2.437 - Black Mage

Which would exclude the majority of the classes, most of which aren't heroes, and deny them the opportunity to enjoy the new content if they don't have or can't find almost a full party of each hero, 2-3 of which are limited time characters. Which makes it even more exclusionary. Maybe if Nexon stopped removing classes from the game, but until then, no.

Although, that does sound like the kind of plantain move Nexon would think is the greatest idea ever.

In theory it would be good to need 1 of each hero and why not 1 of each class, people would need of every class(including the more "useless" and almost extincted classes) making them neccesary