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"Before the creation of the Mundus, before there was really anything, there was Anu and Padomay, the primal forces of Stasis and Change. Their interplay formed the Aurbis, which is everything that exists - imagine two great bubbles that touch and form a perfect circle, a rough metaphor from Vivec himself.
Early in the history of the Aurbis, Anuiel and Sithis came into being, respectively the "souls" of Anu and Padomay, and the first entities with any awareness or agency (though Sithis is obviously the more active of the two, presiding over the Dark Brotherhood as he does.)
Anuiel and Sithis in turn created Auri-El and Lorkhan. Auri-El is known to humans as Akatosh, and Lorkhan is known to Imperials as Shezarr and Nords as Shor. These were the first of the et'Ada, or the Original Spirits; before the creation of the Mundus there was no distinction between Aedra and Daedra. Others soon came into being following them.
For some reason, the Padomaic Lorkhan came up with the idea to form a physical realm, with mortal creatures that could create life, be bound by physical laws, and also die. For some reason Akatosh accepted. What happens next is the basis for most conflict in the Elder Scrolls, in some form or another.
Magnus drafted the plans for the Mundus, and all the et'Ada besides those who would become Daedra - Lorkhan, the Eight Divines, and the numerous lesser et'Ada - sacrificed their immortality to create the Mundus, which is the physical realm of the Aurbis. Fifteen et'Ada took no part in this process and retained the full breadth of their power, becoming known as the Daedric Princes; the greatest of the et'Ada who sacrificed themselves became known as the Aedra.
There were, however, more et'Ada than the famous "gods"; all the minor and less powerful Original Spirits who didn't become Aedra or Daedra became the first mortals of this realm, known as the Ehlnofey. Some of the Ehlnofey were horrified at having been torn from divinity; these would become the Elves. Men, however, did not believe themselves to be descended from the Aedra; they believed they were created from nothing but Lorkhan, and thus owed their entire existence to him. In their opinion, Lorkhan was the hero of mankind, which is why Shor and Shezarr play such a large role in Human mythology.
They fought. The Elven champion, a lesser Aedra known as Trinimac, destroyed Lorkhan, flinging his body into the sky where it would become the moons Masser and Secunda, and shooting his Heart on an arrow into the East, where it would land in Vvardenfell, to be found centuries later.
You asked about the Daedra, so I'll go into them a little bit. A Daedric Prince's Plane of Oblivion is that Daedric Prince, it encompasses their entire being and is completely subject to their will. They are like sentient planets that exist outside the physical universe, but can project themselves into it, and influence it. This is why Azura's realm is a blindingly beautiful palace of rose petals and Molag Bal's realm a fetid, decaying mirror of Nirn, which he always wishes to conquer. There are of course minor pockets of Oblivion that aren't subject to a Prince, such as Mankar Camoran's Paradise, though since Oblivion is infinite it makes sense that powerful individuals might mold parts of it to their will. To destroy a Daedric Prince would be to destroy an entire dimension, when the only beings powerful enough to do so are the Daedra themselves, and, as we see with Jyggalag, even they can't seem to do such a thing, instead relying on trickery.
However, Aedra can become Daedra, as evidenced by Trinimac, who was consumed by Boethiah and transformed into Malacath. Mortals can also become Daedra, as Jyggalag/Sheogorath the First bestowed the position of Sheogorath onto the Hero of Kvatch at the end of the Shivering Isles. This suggests that the status of Daedric Princehood isn't as rigid as it might seem, or as rigid as that of the Aedra, who are defined by their sacrifice."
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My questions pertain to my description of the et'Ada - the way I understood it, or at least reasoned it out, was that while the et'Ada as a group were most prominently symbolized by Auri-El, Lorkhan, Magnus et al. the large majority of them were far less prominent.
Is it accurate to say, in this general way appropriate for a non-lore buff audience, that the Eight became Divines, Lorkhan was killed by Trinimac (or was it Auri-El?) and the bulk of them were transformed into the Ehlnofey? Perhaps I'm completely off-base, in which case I'd be glad to stand corrected.