The Gathering... is made up of 7 uinique classes. Each have their own attributes, skills, and spells.
Once you become "hero" level there are several subclasses to choose from. Some of these subclasses may be applied to all classes, but many are unique to their main class counterparts.
Alchemist Bard Blacksmith Cavalier Champion Crusader Footpad Grappler Healer Linguist Shadow Spell Slinger Trapper