Actually, I'm not sure how invasive they are. I imagine that the magical data scan pierced through material and would have noticed the strange groups of mortals gathering to discuss the eternal power that could probably be gifted to them if they could just free the Devourer.
E: nevermind, Ghaz is lord and master. And I do have an act, thank you very much...not that I plan to use it.
Major Act: Create the Coriarcii. Four slender, runed satellites shaped like cut-up infinity symbols that orbited Despair. They periodically performed a data scan of the world. Using this information, each coriarc is able to selectively enhance a individual's emotion, skill, mental ability or physical ability via a beam of light. They only fire once every 25 years, and always in sequence. The overarching goal of these satellites is to slowly improve the world via select tampering of individuals, who will affect the world. While the coriarchii are automatically 'programmed' to perform their task, they may be manually fired by Lo.
Yeah, your satellites are busy pursuing their program of targeted evolution, not acting as spy satellites. It's probably fair to say they'll tell you if something significant happens (a battle, a major building being erected) but since their mandate is to scan each individual in the world once every 25 years for suitability for upgrade, thought policing just isn't in their power.
Now, if Udil wants to create a caste of dwarves who actually
are his divine thought police, I am 100% behind that because it would be both cool and terrifying. Telepathic Gestapo. o_o
Edit: On an unrelated note I fully expect Gren to die either violently or simply of old age sometime in the next turn or three. It's cool - not all Ascendants ascend. I have a design for another character prepared anyway.