The Blood Book: Tales, Confessions and Rumors of the Worlds is a compilation of writings from various authors in Ted Dekker's fantasy universe in his mega-series, The Books of History Chronicles. This in-the-far-future world is mainly known as Other Earth, and the writings were compiled in-universe by Ba'al, the High Priest of Teeleh (Other Earth's version of Satan).
This book was a collaboration effort of Ted Dekker, Kevin Kaiser and Josh Olds. All three are followers of Christ and strong in their faith, though strongly oppose modern American Christianity. The writings of Thomas Hunter in this novel strongly suggests this, and many of Ted Dekker's other books plainly state it as well.
The Blood Book overall is amazing, though most entries are made by people who would fit only in the category of "evil". It contains writings from many characters, including Mustul, a warrior; Gushon, an alchemist; Thomas Hunter, a very great and wise man; Marsuuv, the queen of a bat-like race of creatures; and Lord Ba'al himself.
Many entries are about philosophy, while others are about the creatures and places of Other Earth and our modern-day world, called Ancient Earth. Though I know for a fact that the actual authors did not believe in the beliefs of their characters, Mustul, Gruson, Ba'al and Marsuuv all have twisted and evil points of views.
The Blood Book continues to expand the world of Other Earth, a bit like Cars 2 did to the cars world that it takes place in. I found it fascinating, and I also happen to be one of only about a thousand people who own it.
A great book and great idea, though possibly bad influence if taken the wrong way. I thought it was awesome, but I was taught well in my faith. You need to read many other books in the mega-series (I'd recommend reading all of them) before reading The Blood Book.