Board Thread:Lore Discussion/@comment-26345499-20150426023135/@comment-77.193.106.144-20150521001309

That's not easy to answer. Actually, knowing the Daedric Princes' purposes on the mortal realm is unfathomable (at least for a majority if we exclude Molag Bal or Mehrunes Dagon).

I think dreams are a kind of spiritual "food" for Vaermina, she can use them to expand her influence beyond her own realm and it serves to make a link with individuals from Nirn, who could become her follower and make her gain more power...

Moreover, if we compare for example Vaermina and Peryite, they haven't an equivalent impact on Nirn : we can consider the second weakest than the first, because each member from every race from every planes of Oblivion can dream while pestilence isn't a persistent threat (Tamriel isn't invaded by skeevers every day) and Peryite is the guardian of the "natural order" in lower planes, not systematicaly Nirn... so he has fewer presence and influence in Tamriel than Vaermina. We could draw the same conclusion with other Daedric Princes compared to Peryite.