For the Great Evil, see Mephisto.
Mephisto, the Lord of Hatred is a tome found in Act II of Diablo III.
It is found in one of Cain's Lost Satchels. Reading it adds to the Judge of Character achievement.
It reads as follows:
The evil of Mephisto, Lord of Hatred, was so pervasive that even after he had been defeated and entombed in a soulstone, his demonic essence oozed upwards into Travincal and corrupted the Zakarum priests. Though he fell to the same heroes who killed his brothers, I fear for us should he ever return. — Deckard Cain