So, about what is Solas planning to do, some specualtion, but not lore-speculation, but character/story speculation (equally bad, I guess, but, oh well
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I just finished another pt and thinking about it I got to the conclussion that whatever Solas is planning to do, it has to be in the benefit of spirits, not elven gods or ancient elves. Even his loyalty mission, couldn't it have been about looking for some ancient elven artifact or whatever? No, instead it's a mission whose main purpose seems to be to show us that he's willing to kill "real people" in defense of spiritis. Even when he talks about the days of Arlathan, it's mostly the magic what he seems to miss.
The contrast with Mythal is huge: Flement was always on good terms with the Dalish, she seems to have them as allies or something since The Stolen Throne to DA2, she says to Merril that thing about the poeple bing to quick to bend their knee and apparenty Lavellan recriminations about her not helping the elves when they needed her seem to make her uncofortable, like she'd have really liked being able to help them. If someone it's working to restore elven greatness, or something along the lines, it should definitely be Mythal.
For what we have being told, Solas seems to have very different interests. I'd go as far as saying that maybe if he locked up away the elven gods it might not have been to protect the other elves from them, but to protect the spirits from the elves.
And connected to this, I don't think he woke up and find out that the world went wrong and suffered seeing how bad things were for the elves (like Corypeus with Tevinter). I think it's more likely that he retired to the fade because he already hated the world back then and that he now woke up because the spirits are somehow in danger.
So, why does he say "the people need me" in the end? And why would Mythal agree to give him her power if their goals are different? Well, I honeslty don't know and I guess it's because I'm probably wrong
but I still think that Mythal and Solas sharing the goal of helping elves/ancient elves/elven gods doesn't make sense with what we have been told about each of them so far... unless,of course, the bad guy they oppose is the same, even if their problems with him are not
I'm totally going to sidle up and cuddle to the theory that perhaps each of the members of the Elven pantheon were beyond just Elven but Elven+Spirit hybrids, perhaps even something more spirit than Elven. Their qualities seem too tied to the qualities/ names of the Spirits revealed to us so far for me to count it out.
I'm there with you, I think the elven gods were powerful abominations, though I have absolutely nothing to support it 