I am curious
What are your Powers doing, while crammed into the Kevellond League?
The Kevellond League is not big enough to comfortable house a billion people, much less 200 billion.
You can leave the Kevellond League freely, but the taraakians ordered you to go there, and stay (they didn't say for how long. For that matter, they have been quite vague about a lot of things, haven't they?)
The Union of Oerth finds itself face to face with the Alliance of Oerth.
And no real way of getting out of their face, because the Kevellond League isn't big enough for that.
The Republic of Selune finds itself face to face with Mina and her Knights of Neraka from Krynn.
Only to find they have turned to good.
However, the Dragon Overlords of Krynn also came, and THEY are still evil, and they are VERY unhappy to be ordered around, and they are VERY unhappy to be crowded in with the rest of you, and they are VERY UNHAPPY to see Mina and her Knights, and they are angry in general.
Crowds of people from Mystara and Krynn are flooding in.
These people are bewildered, confused, and in some cases are now facing deadly enemies.
For example, the Knights of Solamnia are facing the Dragon Overlords.
The Shadow Elves of Mystara are facing the Orcs of Thar.
For that matter, a lot of the monstrous races are showing up.
Creatures like Galeb Duhr, Xorn, Satyrs, Nymphs, Pegasi, Meanlocks, Grimlocks, more than a couple of Death Knights, Chromatic Dragons of all kinds, Gem and Metallic Dragons, Hippocampi, Tritons, Merfolk, Beholders (as temperamental and evil as you can imagine), Dryads, Swanmays, Treants, Shadow Elves from Mystara, a hundred different kinds of humans, all the kender of Krynn, the tinker gnomes, Thannoi, ogres, minotaurs, sea elves, dwarves of a hundred kinds, the lizard people of Taladas, the Aarocraaka ... I hope you get the picture.
This does not include all the new races and beings your Powers have thought up. There are Cydians here, Cydians there, Cydians everywhere!
The situation is very tense, at best.
Conflict - everything blowing sky high - could occur at any second.
Just one Power, now in the Kevellond League, inciting the people and beings present to do battle, would cause this place to go up in a mushroom cloud.
Just one Power.
Just one!