[sergex]

Well since Mictlan both gets +3 blood slaves a turn and the Bind Fiend spell to start off, you can think of the Fiends as the national unit of Mictlan. Even just using the +3 innate slaves a turn you can summon a Fiend every other turn just using a Blood 2 Mage. You can choose to recruit some slaves with a King but I find that they route right away and that it's not much use to round them up from the neighboring provinces. They aren't useless, but I choose not to use them for early expansion.

I'm not big on blessing strategies usually, but I could see Mictlan being used that way. There are probably better nations if you just want to just use sacred units, like the Tuatha Man or Marignon flagellants though.