The Book of Honesty is one of the eight talismans of Sir Cabirus, representing the virtue of Honesty. Written by Ravenhurst of Moonglow, the book dwells on honesty, truth and the meaning of life, looking for deeper answers. It is a strong symbol of virtue.
The Book of Honesty was hidden by the Seers of the Moonstone. The Avatar found it in Ultima Underworld, in a hidden, key-shaped room on the sixth level of the Abyss near the library. The hint was that knowledge is the key. It was cast into the lava of the Abyss later, to banish to Slasher of Veils.