It is highly regarded by veteran players for its atmospheric writing (much of it by Bill King) and iconic "grimdark" artwork by artists like John Blanche. PDF Availability:

If you’ve been diving into the deep lore of the 41st Millennium, you may have come across a filename that sparks curiosity among veteran hobbyists:

: This book remains one of the last major official appearances of the

Archivist-Scribe Caelus wiped the grease of sanctified unguent from his mechadendrites. Before him, upon a slab of polished black marble, lay the object of his labors. It was not a weapon of devastating power, nor a relic of the Dark Age of Technology. It was a book.