Well, I kind of like the version pitched in this thread, where they want to go full General Quaritch-meets-JENOVA and forge a glorious intergalactic empire of blood and thunder on the desecrated corpse of Gaia. Like, they're still fucking crazypants and evil, but it's the kind of crazypants evil that you could see people getting seduced by.
Yeah, that's sort of the opposite of where I would go with it. Basically, you need to remember that spirits want to influence the physical world, to strengthen their domain. Corruption tainted land will want to poison land around them. Spirits of specific hate will want to spreed that hate, or grow by growing their prejudice into something greater. You know that old quote -
"First they came for the Socialists, and I did not speak out—
Because I was not a Socialist.
Then they came for the Trade Unionists, and I did not speak out—
Because I was not a Trade Unionist.
Then they came for the Jews, and I did not speak out—
Because I was not a Jew.
Then they came for me—and there was no one left to speak for me."
That a how to for a spirit of hate, growing from a small specific hate and fear into something big and dark that can lash out at anyone. And spirits want to grow that way, those intelligent enough to see the path. And they grow by things that happen in the physical world. Just like Shamens and Wise Men might call upon spirits to do their work in the Umbra, because what happens beyond the veil effects our world, might a spirit do the opposite? Do business with normal men and women, so that they do the spirits work here?
And businesses will do a lot for the bottom line. You don't require some weird anti-earth cult, you just required having something that will appeal to a business, or maybe just to the people leading a business. People will do horrible things to each other for weaker reasons.
Unethical human experimentation in the United States - Wikipedia
A spirit of plague lays it's hand on the board of directors after they spread
HIV tainted blood overseas. They would never again know sickness or disease.
So long as the
poisonous pesticides fall on the migrant workers, the the crops will grow fast and strong. A trade of human life for the heath of the field. How else could a desert grow such a crop?
And
there are
many more
places you
can put
such stories.
The driving force should be here, and human, and understandable. You can have things fully as horrific as anything canon Pentex has done, but grounded in human greed and shortsightedness.