I've been lurking a bit on this wikia (mostly regarding the game and lore) and after playing Inquisition i started to put things together. This is really my two cent, feel free to add your thoughts, but remember, let's keep it civil, thank you.

/!\ /!\ /!\ /!\ So, for those who haven't finished yet, please be aware, this might be SPOILERS! /!\ /!\ /!\ /!\

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So, as most of you must know by now, Solas is the Dread Wolf Fen'harel. And Mythal is (or was) Flemeth.

We also know Solas emprisonned the other Elven Gods.

They were 9 Elven Gods.

They were 7 Tevinter Old Gods slumbering in the earth.

So yeah, i really think that the two are one and the same. Fen'harel was stated to be the only Elven God to escape that, so he might have been in uthenera or something completely different (that strange elf-friendly world frome 'Masked Empire', for instance).

Mythal, possessing Flemeth, escaped more or less, in a fragmented state.

And the other Gods are the Archdemons (past or future). This could explain why Flemeth seemed to have a link with the taint (something along those lines).

Now the big question is: why is there the Taint, and what is its relation with the Elven Gods?

Could it be some sort of ritual to punish both the Gods and the Tevinter, from a very desperate Elf?

Could it be something else entirely?