The World of Warcraft: Wrath Of The Lich King expansion pack‘s manual already came included with the latest World of Warcraft patch. Albeit it’s just in black and white and slightly outdated with the text still saying in the Death Knight description that runes can be customized, which has long since been removed from the class. Still, there are some good (spoiler free) lore writeups in there.
Here’s how to access the WoW: WotLK manual:
* On your computer, go to your World of Warcraft folder (usually “C:\Program Files\World of Warcraft”).
* Go to the following folder: “\Data\enUS\Documentation”.
* Then open the Wrath Of The Lich King manual by opening this file: “Manual_WLK.pdf”.
Via WoWforums, thanks to Joseph for the tip.