From the publisher's website:
The Tome of Blood, a supplement for Black Crusade, is the second of four books delving into the darkest secrets of the Ruinous Powers. It is devoted to Khorne, the Lord of Skulls, perhaps mightiest of the Chaos Gods, and his powerful minions who carry his blood-drenched banner across the worlds of the Screaming Vortex. Within its pages, Heretics gain terrible new armaments and weapons to wage war, new devices to carry their wrath across the battlefield, and more to aid them in their struggles against the hated Imperium.
The Tome of Blood introduces four new Heretic Archetypes, along with deadly armaments, mighty Daemon Engines, bloodthirsty Daemon Weapons, and much more for the frenzied disciples of the Lord of Carnage. Players of all alignments will develop powerful, unique Legacy Weapons and fight in huge Mass Combats against the lackeys of the Imperium. More blood-soaked areas of the Screaming Vortex are revealed, such as the gladiator pits of Kurse, Furia’s savage oceans, the xenos-infested worlds of Berin and Asphodel, and the infamous War Moons of Talax. Heretics will also go on an adventure into the deadly wastelands of Messia to wrest a legendary Daemon Weapon from a vast mutant horde!