Era of Upheaval

The Era of Upheaval is the name given, in 1479 DR, to the time from the the Avatar Crisis through the time of the Spellplague, the merging of Abeir and Toril until present day.

Information known previous to publication of Forgotten Realms Campaign Guide
Very few facts are currently known about the Hundred Years of Chaos as it has not happened yet in established realmslore.

What is known is that several climactic events are to occur over this turbulent century, including, but not limited to: the reemergence of the Empire of Netheril, the coming of the Aboleths, the 'joining of two worlds', the rise and fall of the church of Eilistraee and most influential of all, the deadly Spellplague. From what can be gathered, Luskan, Spirit Soaring, Sembia, Mulhorand and Thay have all been destroyed by the 1470s. The only two bastions of civilisation left are the Silver Marches and the Orc Kingdom of Many-Arrows, though these places too, have their share of problems with terrorism and political instability.