User blog comment:Timeoin/Dragonborn Screenshots/@comment-4043978-20121119225120/@comment-1600847-20121120014801

For some reason, UESP.net (pretty much elderscrolls wiki, but with more pages) has long and descriptive articles on The Infernal City, but elderscrollswiki has none. It outlines what I've been saying: Vivec was taken, the Ministry was falling but Vuhon, who later called himself Umbriel, built the Ignenium to keep it aloft, but Sul destroyed the Ingenium to avenge his wife.

If you don't trust UESP (which would be odd, because it's the same thing as this site), you can always read Infernal City and Lord of Souls online. There are lots of sites where you can read them for free, without any downloads.

If you read it, you'll see what I'm saying: Vivec dissapeared and his magic no longer sustained the Ministry.