Protector
Protectors are innate tanks with towering figures and tough skin. Wearing a suit of heavy armor and holding a huge hammer, protectors always stand in front of teammates and fight to their last breath, as long as they are alive, their teammates will never be in danger. Aside from using the Derision Skill to provoke hatred, they can also accumulate inner wrath to break out incredible destructive power in a twink.
Only available to: Titans
Class Type : Tank


Mage
God determined magic as the supreme rule on Grand Mundo. In order to drive away all magical elements throughout the world, an extremely great talent for magic is required. Among the five races, vampires have the best endowments and humans follow, but it is difficult for other races to become mages who are capable of casting raining destruction down upon their enemies in a wide area of effect. A powerful mage is very popular with teammates but is a headache for opponents.
Only Available to: Humans and Kindred
Class Type: Spell Caster


Assassin
Assassins are always considered as latent killers, capable of casting deadly strikes on incautious foes from behind swiftly. Humans and vampires are the best to be assassins which is a melee class requiring high agility and strong strength. Using a double-edged blade, assassins often launch a furious whirlwind attack on their enemies in the back.
 Only Available to: Humans and Kindred
 Class Type: Melee attacker

Priest
Priests are also a class capable of using magic, but instead of magical elements, they gain power directly from the God based on their beliefs. On Grand Mundo, only humans and elves with the firmest conviction are qualified to be priests who are endowed with healing ability as well as fierce holy power. Thus, think it over before you intend to attack priests secretly.
 Only available to Humans and Elves
Class Type: Healer


Warrior
A warrior should have a strong and agile body, so short dwarves and clumsy Titans are unable to become excellent warriors. Neither do vampires, as they don’t like holding a huge sword in hand. That is to say, only humans and elves are fit for this class. Wearing a suit of shining armor and wielding a two-hand sword, warriors may use different fighting skills depending on different stances and give a fatal blow on their enemies at anytime.
Only available to: Humans and Elves
Class Type: Melee attacker

Marksman
Dwarves and Stonemen are two races incapable of using magic, but Titans have an advantage in gigantic stature. Dwarves have no choice but to develop advanced technology. With the help of guns, dwarves can shoot at enemies from a distance. Moreover, gunners play an indispensable role in a team owing to their wonderful control ability.
Only available to: Dwarves
Class Type: Ranged Attacker

VampiresAs the name implies, only vampires are able to choose this class. Actually, the first ancestor of vampires was a human mage named Howard, after turning into a vampire, he combined his magic with the strength from his blood to create a brand new class. Vampires can not only cast awesome spells, but also specialize in melee skills, so others are unlikely to correctly anticipate their next actions.
 Only available to: Kindred
Class Type: Combination

Bard
In Forsaken World, only elves with a talent for music are eligible to be bards who can use music to cripple foes through playing the harp. In comparison with other classes, bards have an extra music column in the control interface. Each of their skills has corresponding musical notes and powerful magic effects cannot be unleashed unless those notes make up music.
Only available to: Elves
Class Type: Spell Caster

Taken from MMOSite

Hmm, maybe I'll be a Priest.