Unfortunately there's the chance Corypheus and his followers might have an advantage compared to them when it comes to the ancient elves; if he truly is what he professes to be then they have no way of knowing what he has seen. All of them know their history. All of them know of Tevinter and the ancient elves.
It's precisely why she took a great deal of pleasure in killing the Venatori that sought to take her eluvian from her.
"As I offered in the past, I am unopposed to working with others on such matters. It could be that we might never know the truth though it might well stare us in the face though all ancient elven ruins are spread far from one another. Your people have never left roads. Not once." Morrigan knows why but she's never asked if the Dalish have any theories as to why. She's never needed to since she learned that the eluvians were for much more than mere communication.
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It's precisely why she took a great deal of pleasure in killing the Venatori that sought to take her eluvian from her.
"As I offered in the past, I am unopposed to working with others on such matters. It could be that we might never know the truth though it might well stare us in the face though all ancient elven ruins are spread far from one another. Your people have never left roads. Not once." Morrigan knows why but she's never asked if the Dalish have any theories as to why. She's never needed to since she learned that the eluvians were for much more than mere communication.