[PvK]

The file is there. Try right-clicking and downloading it to your computer. Then load Acrobat, and then load the file into Acrobat manually.

It explains dominion in great detail, with the exception of Mictlani details.

As we've alluded to, most forms of dominion increase have a chance of "spreading", affecting not the province of the source, but an adjacent province. According to the article, which seems consistent with my impressions from playing, the chance of spread goes up, the closer to the maximum the source province is. Note that you can't exceed your max dominion strength, and that max strength goes up by one for every five temples you have. The level in a province also has a strong effect on how hard it is for opposing sources to reduce that dominion.

PvK