I did not see a topic for Tree of Savior, so I made one!
Tree of Savior is the spiritual successor to Ragnarok Online. It has a beautiful art style and a complex class system. It plays like a 2/3rds perspective action RPG.
Take a look at the known class list so far, they plan to have 80 classes eventually.
You can see the class descriptions here:
The way it works, is you pick one of the 4 Rank 1 classes to start then every few character levels (15?) you can chose either to improve on your current class (up to 3 times) or take one of the new classes available to your main class at that rank.
An example would be:
Rank 1 - Archer 1
Rank 2 - Quarrel Shooter 1
Rank 3 - Quarrel Shooter 2
Rank 4 - Wugushi 1
Rank 5 - Wugushi 2
Rank 6 - Wugushi 3
Rank 7 - Musketeer 1
The founders access starts tomorrow morning at 2am EST. The game is available on steam. The official release date is April 28th.