There are many discussions and blog posts about the new hero class - Death Knight (DK), released in the latest WoW expansion "Wrath of the Lich King" (魔兽世界:巫妖王之怒). Instead of launching into the merits or a guide of how to play the DK, let me show a few screen shots I took of the initial quests of DK. These initial quests provide talent points for the level 55 DK, and give an introductory story to guide DK into the WoW (魔兽世界) .
The conversations in the screen shots above and below hinted at the life of the player before he/she turned into a DK, and alluded to the possibility of a DK to turn 'good' again in WoW.
Here's the other screen shots of the 'final battle' at Eastern Plagueland between Arthas (i.e. Lich King)'s forces and the Scarlet / Argent Dawn armies. It is this battle where the DK forces 'turned' good when the commander of the DK forces awakened from the dark side.
Again the conversations are pretty interesting. The entire 'introductory' quest and story of DK are well planned, and I think this is what sets WoW apart from many other 'hack and slash' MMORPG with little storyline to offer.