Tank : The Guardians ability to wear Heavy Armour and defensive skills enable him to face creatures that would make other heroes morale fail. He also has the ability to draw the foes attention away from his allies and to himself.
In terms of other MMORPGs, the Guardian fulfills the role of Heavy Tank, with lower overall damage output in exchange for improved survivability. It is one of the hardiest of classes, with extra Morale and a number of abilities which mitigate damage taken. It is also a good soloing class, although the lower damage output means defeating monsters takes a bit longer than for some other classes. The Guardian also has reactive abilities that can be used after blocking and parrying.