Quote Originally Posted by Lord_Gareth View Post
Do the forces of Mechanus invade the Prime Material plane? If so, why?
Depends which forces you're talking about.

Inevitables go and bother Primes all the time. Formians sometimes invade Prime worlds to set up hives. The modrons would only go to repair something like a planar breach to Limbo or hunt down a rogue hierarch who had given the inevitables the slip. Modrons are occasionally called as planar allies by powerful societies of law - there is evidence that followers of the Pharaonic pantheon have been visited by modrons in this manner - but in general they are highly disinterested in the Prime.

If a being wanted to take advantage of Mechanus' unparalleled ability to gather information, would it be possible to bargain with them for knowledge - say by offering to obliterate a demon lord or another significant source of Chaos?
Depends who you're bargaining with. Modrons can make use of materials with powerful magical properties just like anyone else - gold is good everywhere, though they won't take kindly to a bribe, and modrons have a particular interest in diamonds. Lower hierarchs can negotiate contracts for the sale of information; elite hierarchs have a lot more at their disposal, but their time is valuable and you'll need a referral (one you haven't bribed someone for, either, or you'll come to the meeting and find an inevitable waiting there). The means for securing such a referral might spring from your deeds in the struggle against chaos.

As for Primus... Primus knows whether or not you need his help. He's Primus.