The Krivbeknih

The  is a book added to Fallout 3 in the Point Lookout add-on.

Said to possess a dark power, it used to be in the possession of the Blackhall family but was lost long ago. It is highly probable that the Krivbeknih is the book mentioned in Jaime's Personal Journal. It is likely that Jaime's father had obtained the book before the Great War. Should the player decide to side with Marcella in the quest, The Dark Heart of Blackhall, The player must take the book to the Dunwich Building back in the Capital Wasteland, and press it against the obelisk in the Virulent Underchambers to destroy it. How the book found its way back to Point Lookout after being in the possession of Jaime's father is unknown.

Related quest: The Dark Heart of Blackhall
Obadiah Blackhall wants you to retrieve this book from the Ritual Site in Point Lookout whereas Marcella wants it destroyed.

Behind the Scenes
The Krivbeknih is a reference to the many esoteric and arcane tomes featured in the Cthulhu mythos, such as the Necronomicon, Book of Eibon, Pnakotic Manuscripts, etc. These artifacts play a similiar role in the mythos, often being used by evil men for sinister purposes.