So Im having a thought and thought Id bring it to the people who know a lot more than me. But what if Mythal was more of a dragon (I know this theory is old) than Elf/God, she is different than the other Evanuris, to me it seems in more ways than just being kind. Is it Andruil that was messing with the blight? Maybe they tried to control Mythal by infecting her? Thats why the other old gods are locked away? They are dragons too. Maybe Solas put them to sleep? To keep them from being controlled by the song and preserve them. And we know he hates the Grey Wardens for killing them but this would make it all the more personal. Because in the Evanuris' thirst for power they would destroy the world. Step one:control the song and blighted old gods.
And Cory being able to control a dragon with his stolen elfy power????????
Solas loses it at some point but it does not seem likely that he would do all this just because they killed Mythal. But maybe its the way they killed her that sickened him so much. By trying to control her? Corrupting her. We know how he feels on slavery. Everything they stood against.
And maybe Solas was the one who had to put Mythal down? I saw somewhere floating around on tumblr (I cant remember where, I didnt think much of it at the time) that someone datamined Trespasser and apparently there is a room which solas wants to forget/does not want people to see, and this is his breaking point.? I have no idea what that means, but being forced to kill someone you love and respect after they are turned into something you and she fought so hard against would break anyone. "So long as the music plays, we dance" <<<<<<Hmmmmm
Maybe Mythal brought Solas to her to do the job of killing her. Maybe the Mythal inside her blighted form is what called out to Solas to have a body so he could "protect" her by killing her? Cant remember the Cole banter from Trespasser at the moment but she did call Solas to her right? Solas wants to serve Mythal but the line Cole says in base game, its not abuse if you ask for it, and Solas says, not always true?