Tiamat pops up in Faerun. Chromatics get massive buffs. How

Little changes.

Faerun has over fifty factions vying for power, and if one suddenly received an incredible boost, the others would react in order to maintain the status quo.

It would need more than a single god appearing for any dramatic changes to take shape.

>>50786783
This literally is what's in the process of happening in one of the 5E adventure paths.

She's banished back to Baator.

Elminster gives her a good dicking while simultaneously performing incredible magic to reduce chromatics back to their original power. Everyone is in awe. The PCs are somewhere off in some meaningless but unnecessarily detailed village in the Spine of the World, helping a shitfarmer fight 10 goblins.

also >>50788403

A five man band of scrappy adventurer's of mismatched races and backgrounds go on a grand quest to send her back.

Another god skills her, again.

>>50788403
It also happens in 3.5 with Red Hand Of Doom.