In the Demonology book my Mongoose, sacrifices give you incredible bonuses when attempting to summon greater Demons or Demon princes...
If you have that book, it makes sense.
I am a dead buy for this book, because some, not all, but some of my games have a darker edge, and it is a shame that one has to go to netbooks to find info on the darker things in Dungeons and Dragons.
I personally can't wait. I also thought that AEGs Evil wasn't that bad. It had a lot of good stuff in it if you read it carefully. Most of it was Roleplay stuff, and I like that. The unsuccessful stuff in that book was based on summoning rules, etc... Plus it was horribly organized. But I proudly bear it on my shelf, but I know the the Book of Vile Darkness will eclipse it by far. Have any of you seen Call of Cthulhu D20 done by monte? THAT is what I am talking about.
This book will be in my hands virtually the moment it hits the store!
Razuur