Since I am a DragonStar Fan: Invasion of the Dragon Empire.
Several years a powerful battle was fought - Faerun isn`t an easy target, since it has the most powerful magics.
Finally, to survive the Empires Attack, the gods - which were nearly "absorbed" by the DragonStar pantheon, and only survived thanks to the strong believes of the Faerun people - sacfricied themselves and many of their followers (especially the chosen ones
) to create a great magical barrier, blocking any attempt to enter the Faerun System via interplanetary or interstellar momvement. At least, for now...
Outside, the Empire might try to use "Multiple Planeshifting" to reenter the world - such powerful magic must be in the hands of the Dragon Leaders, not of primitive beings like Elves, Humans and co...
Inside, the remnants of the Empire forces are still fighting, and trying to gain allies, especially the Drow.
The "Old" Faeruns are trying to rebuild what was there, but the loss of many gods made them unsure about what to do, and distrustful. Romours are spreaded, that some of the Faerun Coalitions worked together with the Invaders, and so, a new kind of time of trouble is arisen...
Mustrum Ridcully