Haereticum
From Tardis Wiki, the free Doctor Who reference
The Haereticum was a virtual construct in a world created by the Monks. It meant the "library of blasphemies". It was a secret underground library in Vatican City which contained the book Veritas. The library contained secrets so great that some committed suicide after discovering them. It was founded by Pope Benedict IX in the 11th century, and was written in a language only a few could understand (TV: Extremis)
