Since they posted it (both Kalanyr and Forsaken One) I have no problem with elaborating now.
The scouts find this out anyways.
The Hellfurnaces, Crystalmists, and Barrier Peaks, including the Valley of the Mage, are completely free of humanoids, giants, drow, or anything else of evil alignment normally there (except for a few wild monsters.)
It's like they have evaporated from existence.
Great fortresses and encampments, giantish settlements and outposts, drow watchtowers and cavern bases; they are all empty.
For those few scouts brave enough to venture very far into the Underdark, the same thing is found.
Nobody is home.
Wherever the drow, giants, and humanoids went, it must be really deep down.
With the mountains abandoned, it will be easy for the Baklunish and the Kevellonders to take all the heights and valleys, to overrun the whole mountain range.
There is nothing there to take, no opponents to fight.
Just a windswept emptiness, scorched by the summer sun, swept by the cold winds of high altitudes, while torrents of melted snow run down into raging mountain rivers.
There aren't even any drow, giants, or humanoids in Geoff, the forests in Geoff, or in any of the lowlands.
An eerie silence prevails over all the western mountains, from Varnaith in the south to the Valley of the Mage in the north (I would have said Ket, but it is quite noisy there!)
- - -
The Baklunish Confederation regains control of Zeif, Tusmit, and Ekbir when it is discovered that dopplegangers impersonating the top officials took over the governments of those three countries.
A few agents of this mysterious Black Brotherhood are also unmasked, but they all drop dead on the spot, their souls dying with them.
Forrester discovers an agent of the Black Brotherhood in his camp, in Lyrn!
How that agent got there, considering the Torilians only just landed on Oerth, is anyone's guess.
Like all the others, he cannot be questioned, for he and his soul perished upon discovery.
They must be real fanatics, these Black Brotherhood people, to have agreed to such conditions as dying body and soul if they were caught.