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This article contains information that is no longer relevant to gameplay, but is kept here for informational purposes.
The item had a small chance to drop from any destructible or openable object (like a shelf or a chest) in any act, or even in the Nephalem Rift.
It is one of the two legendary crafting ingredients that could be obtained at any character level.
"Written by Lord Pender himself, this unique tome contains complex algorithms, visionary theories, and obscure philosophy. Sadly, it was stolen by drunken adventurers from Caldeum’s Great Library. Since it never appeared on black market—or anywhere else, for that matter, we can only assume the thieves met an untimely end." —Deckard Cain