Death knight
The death knight combines martial prowess with dark, necromantic energies. It is the first hero class in World of Warcraft. Having a non-hero-class character at level 55 or above is (the only) prerequisite to be able to create a death knight. Death knights start at level 55 in a new starting area in the Eastern Plaguelands with multiple spells and abilities ready to use.
They are a hybrid class, able to tank and/or deal damage. They are a melee class with casting abilities like the paladin, and can raise undead minions. Although they will have minions, they will not be a pet class (unless they have appropriate talent), but will use some of their mechanics. They are the only class to use the rune resource system. It is also notable that death knights have their own talent trees comparable to current classes.