[Peter Ebbesen]

Err. tried this in one MP game as a thematic Mictlan pretender, and it turned out quite well in the long run, though it was (in retrospect) a very risky proposition as it relied on being able to expand far away from my capital to have somewhere to put my researchers and on construction to enable a Rain Priest to summon Ice Devils, which, of course, took longer time due to low initial research, which means I would have lost out in an Ice Devil rush (which did not happen in that game). It did give me a very powerful SC throughout the game and a super ritual caster, and the bless effects (though minor) were well thought of by every single Priest-Mage. Having tried it, I am not sure I would dare use such a setup in MP again as the number of things that can go wrong are large. However, when it works...

Lord of the Night
Dominion 7
Air 3
Earth 4
Astral 6
Death 4
Blood 5

Order 3
Production -3
Heat 3
Growth 1
Fortune -2
Magic -3
Mausoleum

On heat: Income takes a hit but devils like it
On magic: Research as far away from your starting point as possible and/or next to somebody with a magic scale. The best you can get is a "0" effect but that is quite enough if you buy enough of Michtlan's priests. It is also nice to get MR bonuses back home where important mages make rituals.