Lord Skrolk is one of the most powerful of the seven plaguelords of Clan Pestilens and the keeper of the Liber Bubonicus.
The Liber Bubonicus, also called the Book of Woe, is a foul tome inscribed with the clandestine knowledge of the Skaven's magical Lore of Plague, and it contains the secrets of every pestilence and plague in the mortal world. Several of its verses were written by the Verminlord Daemon Vermalanx the Corrupt, although it is not clear if he is the tome's sole author.[4a]
The Liber Bubonicus is owned by the Skaven Clan Pestilens, most notably by its keeper, the plaguelord Skrolk, and can be used indirectly by other Pestilens agents and allies through the use of Warp Scrolls copied from its text.[1a][2a][2b]
Long ago, the Liber Bubonicus was stolen by the agents of Clan Pestilens from the servants of the Chaos God Nurgle, who have a similar interest in creating and spreading disease across the Known World.[3a]