I actually think alot about Skyrim logic. I've actually been (over)thinking about science and magic in Skyrim. It's kind of like a mixture of Fullmetal Alchemist and Star Wars. Technically, Dremora, Lurkers, Seekers, ect. Can choose their forms as well, but typically resemble the natures of their Lords or environment, at least while in Mundus. The truth is that we may never know what a Daedra's true form would be. The same could actually be said for mortals as well. We (especially elves, in their belief) resemble the Divines or the races respective gods (dragons would be Akatosh for instance). This is especîally seen in ice wraiths and spriggans who resemble their
Environment
That said, it seems that only the lords or gods have the ability to change their form. While us "lesser creatures" can only resemble what we are used to seeing.
This also brings a theory about the Dwemer. Perhaps the really were transported to another realm. Since Daedra cannot die in our realm, could the same be said for Tamriel-ians in there's? If Thats so, perhaps the Dwemer are simply in another realm. Waiting to die (or taking control).
That brings up the problem of why aren't they back? 4000 years is certainly too long for anything, even an elf, to live. Some answers to this could be that they have achieved their ascent into godhood, or they are immortal, or that the realm is similar to the Soul Cairn, where hey cannot leave. Also, time could be different in that realm. Making 4000 years only be 2 years, or even 2 seconds. Then again, maybe they did die, and have no bodie to return to, or it takes time to reform (in this case, millennia).
Things are convaluted in Mundus. The sun is not actually a sun. It is called Magnus, named after the father of Magic himself. When he found out that the father of man, Lorkhan was draining the essence of the "god like" beings, he was the first to leave. He tore a hole in the very fabric of Tamriel when he escaped. Mortals perceive this as the sun. The essence drained from Magnus is what we call "magicka." Either that, or the "sunlight" is magicka.
In fact, all of the stars and moons of Tamriel are "exit holes" of the deities that escaped from Lorkhans scheme. The eight that stayed are our divines, and the ones that left are technically Daedra. There are thousands of Daedric deities. Yet only about 25 or so have an interest in Tamriel. Our "Divines" are actually weak compared to the Daedra, since their power is drained into Mundus itself. So, either they hate Lorkhan, and subsequently, mortals, or are simply too weak to interfere too much into our affairs.
Lol. I'm really sorry. This doesn't contribute at all to the RP. I just started typing from my mind. Still, I don't feel like deleting it all. Some of this is speculation. And other stiff is what I've read or seen in videos