So I was thinking about the similarities between Morrowind and Shivering Isles (giant mushrooms, Hungers etc.) and while Morrowind isn't an extension of the Shivering Isles as it has numerous differences I couldn't shake the feeling that maybe some things we think are native to Tamriel actually come from various realms of Oblivion.
For example, we know Vampirism and Lycanthropy come from Molag Bal/Hircine respectively, so how much could daedric princes have influenced Tamriel? Netches look outlandish but then again so would Minotaurs to Dark Elves visiting Cyrodiil, could either of those (or any creatures we have encountered) be influenced by Daedra?
Or is it that the realms only look the way they do because the daedric princes are influenced by Nirn (were the first books written by mortals, or were they found in Hermaeus Mora's Apocrypha before that)? Or is this just a "What came first the chicken or the egg" type question and no one is too sure?
Also, does anyone know if any other Oblivion realms share similarities with Nirn?