Ok i guess it wouldn't have to be all the Gods.
I was looking at it kind of like the new Clash of the Titans movie when Zues unleashed Hades up on the world.
Well any way this is what I was working on
After the time of Troubles the Gods were so angry with mankind that they rained down meteors from the heavens, shook the very core of the world with devastating earthquakes, and sent forth a plague that just about completely devoured the rest of mankind. Great cities were lost and mankind was nearly wiped from the face of the earth.
The humanoids that lived never forgot this day. For they knew the only reason they lived was because the Gods allowed them to. The message was clear the Gods were truly just that “ Gods “ and mankind would never even come close to matching their raw power.
Some of the evil Gods saw an opportunity after this great devastation and took advantage of it. Which only helped to decreased the chances of mankind’s survival in this newly under populated world of ruins.
I'm not sure if after the time of troubles is the best place for this to take place but its what I have came up with so far. If there would be a better point in time please let me know.
I was just trying to make this idea fit with in the Forgotten Realms world. Trying to make it sound like it could happen. But I'm not a Forgotten Realms Lore fan so I wanted to ask someone who is that could help me make this some what fit in the lore.
Thanks