One of the things about World of Warcraft that Blizzard got right is how they manage balance the various classes (and when something gets too out of whack or unbalanced, a patch usually attempts to fix (nerf) it.) Another thing a good MMORPG needs is a balance between being able to play solo and to play in groups, guilds, parties and raids. Again, they tend to get this right more than most competitors. With the WotLK expansion release for World Of Warcraft the Death Knight class becomes available for anyone with a level 55 or above toon. The expansion also raises the level cap to 80 and allows for increases in class talent trees. This WoW Death Knight guide will deal with the best talent build for rapid solo leveling.