The Liber Bubonicus

 is a arcane item in Total War: Warhammer II.

Description
''This decrepit tome bristles with dark secrets and eldritch powers. Reading from it summons dark thoughts and grim deeds.''

Lore Background
''The Liber Bubonicus is one of the most holy of artefacts within Clan Pestilens, containing some of the greatest and most horrific lores conceived of by these fanatic monks. This foul book is inscribed with the clandestine lores of corrupt magic, and contains the secrets of every pestilence and plague in the world.'' [1]

Source

 * [1] Warhammer fantasy wiki - Liber Bubonicus