Up until level 10 a player is free to experiment with different classes (in accordance with race restrictions at the starting area). Once you are level 10 you are commited to a chosen class.
The classes are divided into four main groups which are the Protective Fighters, Offensive Fighters, Healers, and Arcane Casters.
Protective Fighters:
The tank fighters, meant be durable
in combat. All of them can use plate
armor.
Offensive Fighters:
The light fighters, who emphasive on
offense. They generally can wear leather
or chainmail (except Monks).
Healers:
These magic users emphasive
healing & supporting allies. All can
wear leather armor (except Disciples).
Arcane Casters:
Powerful spellcasters.
They can only wear robes.