Arventia had a rather fascinating class system.
There were eight main classes: Warrior, Berserker, Mage, Archer, Healer, Supporter, Assassin, and finally, Beast Master.
But here was the interesting part: players weren't locked into just one. They could actually pick up multiple classes if they wanted, even as many as they wanted! This made character-building incredibly flexible, opening the door to countless playstyles and combinations. A Warrior-Mage hybrid, an Assassin-Healer, or even a Supporter-Beast Master—anything was possible. The only limit was the player's imagination, resources, and time to grind.
Still… that didn't mean stacking as many classes as possible was the smart thing to do. Quite the opposite, actually. Most players were strongly advised to focus on one, two, or at most three main classes.
Why?
It was because of the Class Experience System.