The fearsome death knight, World of Warcraft's first Hero class, is not your average adventurer seeking to prove his or her worth on Azeroth's fields of battle. No longer servants of the Lich King, they begin their new calling as experienced, formidable adversaries, heavily armed and armored and possessing an arsenal of deadly and forbidden magic learned in the Lich King's thrall. To create a Death Knight you must have at least one character on any realm that is level 55 or above.
Strengths:
Can wear all armor types and wield most weapons.
Mixes melee attacks with Frost and Shadow ranged spells .
Rune system means virtually unlimited energy.
Blood abilities provide self healing.
Can return at will to the Ebon Hold.
Free mounts and weapon enchants available only to death knights.
A hero class: begins at level 55.
Weaknesses:
Can't use shields or ranged weapons.
More dependent on abilities than passive defense for survivability.
Dependent on rune cooldowns and runic power generation.