TOO LATE FOR NOPE. I wanted to hold this in, I really really did, because it's a metric fuckton of nutbag in one tiny post. But the poison must out.
Fen'Harel was three Old Gods.
One entity. Three Pantheon gods. I may be chasing an elaborate red herring, but there's simply too much evidence to ignore: Solas is Fen'Harel, but before that, he was Dirthamen / Falon'Din. His powers are their powers, his sins are their sins, and it would finally explain both his transformation to the Dread Wolf and his redemption to the Pantheon under the watchful eye of Mythal.
1. "You're different, Solas. You're in both places."
This is the key to unraveling the core contradiction of the mythical Twins that are not Twins. They are aspects of the same being- an entity existing both fully in the fade and fully in the physical. (If this is indeed unique to Solas, this puts a wrench in some of my other theories- though it's possible whatever happened to entities that pre-existed the veil when it went up left him somehow intact while the rest were split).
2. "Ma ghilana mir din'an."
"Guide me into death." The final request of the spirit of Wisdom in Solas' personal quest. Aside from Mythal, this is the character most likely to have known Solas before he was cast down as the Dread Wolf or restored to the Pantheon as Fen'Harel. He greets her as kin -"lethallin"- and she responds in kind, speaking to him as the form in which she knows him best: Falon'Din, friend and guide to those on the other side of the Veil. Solas as F'D hardly needs to be explained. Solas. Fade! Solas. Spirits are Awesome! Solas.
3. "May her ashes be gathered by Falon'Din and carried safely."
Solas approves. ...yes, I know. "He's a compassionate person!" But you don't get his approval from rescuing druffalo, do you.
4. "You really don't let anybody see under that polite mask you wear, do you?"
~ insert appropriately snide and scathing comments about Dirthamen, God of Secrets, and the damned apostate elf whose favorite pastime is not telling anyone, anything, ever. ~
5. "Though you reach out in compassion, I must now insist that you... forget."
This is the only direct clue we have that links him to Dirthamen as well as Falon'Din. The important distinction here is the difference between Solas and Cole's abilities. As a Spirit of Compassion, Cole's domain is pain and hurt, which allows him to see the path that Solas has chosen. But there's not necessarily any hurt or pain involved in taking that away. (Unless you assume that Cole was unduly upset by what he found. Ignore that. Stay with me.) What Solas is doing is different. What's being washed from Cole's mind is knowledge- or more accurately, a secret. As we see at his temple, this is the core of Dirthamen's power and the boon he grants his followers: relieving them of the burden of their secrets.
The secrets are madness in our ears, but they are ours
The Highest One cannot take them from us.
Only Dirthamen, our Keeper, only he
And if he does not take the secrets
they are ours forever.
6. "I do not believe they sing songs about Falon'Din's vanity."
Vanity. Arrogance. Ego. Pride. They are all one and the same. If Solas' sins are Falon'Din's sins, then he has more blood on his hands than any of us would ever have imagined. "The blood of those who would not bow low filled lakes as wide as oceans", until he turned on Mythal. Even then, with the combined force of an allied Pantheon, he only surrendered when his brethren bloodied him in his own temple. This, then, is his great crime- the treason for which he was first stripped of both his standing and form and cast as a monstrous beast into the Abyss. This is how the Dread Wolf began.
7. "But Mythal’s magic sapped Andruil’s strength, and stole her knowledge of how to find the Void."
But how did the Dread Wolf end and Fen'Harel begin? What service could he possibly have offered to the Pantheon to regain his place among them? The answer lies in a threat to the Pantheon greater than any he had ever posed: the blighted madness of Andruil. Mythal needed him. She could subdue Andruil with her magic, but only Dirthamen had the power to wipe Andruil's secret path to the Void from her mind. In exchange for this service, the Dread Wolf rose to the Pantheon once more as Fen'Harel, loyal Hound of Mythal.
8. A picture is worth a thousand words.
Don't tell me you don't see it. You do.
I know this is insanity, but screw it- I like it, and I'm keeping it. It feels right. Doesn't it?
And not just because it makes Solas #3 on the Pantheon power list, instead of being some random elf punished, then inexplicably raised to Pantheon, then bound to Mythal. It also means that if I'm right about Mythal's orb not just being a focus, but a physical representation of her leash on him and the restriction of his powers...
...we are in for some serious, serious, badassery now that it's rubble.
Solas: "Most tales paint Falon'Din's stubbornness second only to his self-regard."
Inquisitor: "I'm surprised they let such a monster live."
Solas: "One does not lightly kill a god, Inquisitor. Even in legend."
ohhh, you sly wolf.