From publisher blurb:
The coming of the Avatars and the Time of Troubles caused tremendous changes in the Forgotten Realms. Areas of dead magic and wild magic have appeared; character classes have been altered; new magical spells have been discovered; old gods have been slain and new ones arisen. All the changes and updates are incorporated into this one essential volume for Forgotten Realms players and dungeon masters alike.
Get new information on specialty priests, currency, new weapons, and treasure. Take a detailed tour of the major cities of the heartland, from the Sword Coast to the Dragon Reach, including the Moonsea, the Dalelands, Cormyr, and Sembia. The most popular and intriguing fantasy world ever published gets even better with this fantastic supplement.