Warhammer 40k fluff thread VI: They see me Ward'en, they haten

[Tome]

EDIT: Crossposting from the Warhammer RPG thread:

I'm planning to include an awakening Necron force in the RT game I run. Most of what I know about Necrons comes from the Dawn of War games and the wiki. What are some descriptions of buried Necron forces in other media, that might go into more detail about the process of a tomb world awakening, and how many Necrons are generally in one, what kind of a threat this is, etc.

The Necron fluff has had massive retcons since the DoW games. I'd advise looking up some more recent stuff to get an idea of what they're like now.