If anyone can answer this question I would greatly appreciate it... excuse me if it is a rather disjointed query.

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The daedra are said to only have the power to change, not create. Except within their own realms, which are themselves. The daedra harness the streams of magicka/creatia which leak into Oblivion to fashion and upkeep their realms. Magicka/creatia can be used to create. Does magicka, without any difference, = creatia? If it is, then I wanted to make this point: The Towers (at least some of them, I don't know if it's universal) harvest excess creatia either from Oblivion (or maybe from Aetherius as well?) in order to form their respective dominions.

If magicka = creatia then doesn't that mean that any magic user is "harvesting" magicka from Oblivion and utilizing it in Nirn, similar to the Towers? And if the Towers use creatia to create, then can't Magicka be used to create?

My point is, daedra use spells while summoned or present on Nirn. If they can use magicka here, why can't they create things here? Or is it some special type of limiting daedric magic. Which only has the power to change, not create?

But even if it is, what changes the type of creatia they use. Is it corrupted by the void? Otherwise it's still the same substance. Why can't even the Daedra Princes fully utilize it?

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There is most likely some glaring inconsistency or ignorance in my questions. But this has been bothering me.

You seem to have taken a quote from On Aedra and Daedra. Then you proceed to provide a number of arguments to the contrary. So I'd say that the book is wrong. Or rather, it should be seen as a introductory text for the layman.

What it seems to be referring to is the creation of Mundus. A process in which the et'Ada cut parts from themselves to create something that had never existed before. It's this sacrifice of the Aedra, one the Deadra were unwilling to make, that sets them apart.

http://www.imperial-library.info/mwbooks/monomyth.shtml#Cyrodiilic makes a point of this.

Thanks, I suppose that is what I did. I'll look into this more. Thanks proweler.