Re: Thulkos as a campaign setting.
Exactly what I was thinking, though I admit I never thought of the Kings of Edom. Tyrannon's followers probably revere the Thousand-Headed God in a similar manner, and both require enormous sacrifices to retain their power. They might even say "By the Great Tree." Tyrannon's main form, the Tree, is pretty stationary as well, just like the God-Emperor.
Also the quote in the book about the followers of Tyrannon using magical sailing vessels to travel after receiving the grace of Tyrannon's Avian Throne does sound like another form of navigation in WH40k.
Well Emissaries are pretty dumb, so I'm sure those things could be summoned after some great effort by the priests of Tyrannon, especially during a climactic battle against his foe, and being his weakest forms they wouldn't be too much of an imbalance.
Thanks for the ideas. I'll look into it, starting with coming up with designs for the revamped technology. You've both been very helpful, and if any more ideas come along let me know.
Thanks.