The Book of Lore
The Book of Lore is an ancient and supremely valuable book dating from the very end of the age of Myth. Legend hold that after the Breaking of the World, a number of books were written and widely distributed to the survivors. Among them was the Book of Lore, which told the whole history of the era. Against all odds, the book survived into modern day, where it became known as "The rarest, most valuable tome you can probably find in your local book store's clearance bin".
An actual, in-tact copy of the original book of lore would be beyond priceless. What survived was not that.
History
The eldest, by date, copy of the Book of Lore existed on M'KHara sometime during the pre-dynastic era. A nineteenth-edition of it was confirmed to exist in 4150 B.G.A.(a point of time considered by some to still be within Classic Antiquity.