I keep saying that you are looking for the wrong things. It doesn't help looking for the cat food if you really need the car keys.
It seems to me everyone believes there is some deus ex machina - some puzzle to solve, and as soon as you've figured it out, you have won. And I have been consistently saying since the beginning that it doesn't work this way.
I will say it again: There is NOTHING that will make the invaders go *poof*. There is no magic wand to solve your problem.
There is, however, a theme to every invasion. And if you figure out the theme, it helps you figure out what to do. But you still have to do it. Just knowing doesn't help.
And that's all I will say because that's already too close to spoilers for comfort.
I'm not saying we are looking for something that will make the invaders go *poof*.
But now, we are facing a Blight that take regions away, and we can't do nothing about it. We have two majors characteristics on BM - 1- Politics and 2 - War. None of them, have anything related to big magic events or blighted regions.
I agree with some that the invasions make things fun and give a little change in things, but there is not much we can do to act against it, just fight, kill the daimons, execute the priests and sons.
If that's not enough, then we need to know what will help. No need to spoiler everything and give us a magic wand to make the invaders go *poof*. But clearly, and as you are pointing out constantly here on the forum that we are not getting it, any hint or clue you are giving are not working . So, maybe it is time for change a few things.
After all, I don't want (or have ways since I have important bills and things to pay) to pay for a book to understand "ok, this is what is happening, oh so that's how it work".