I find the fandom consensus that Solas and the Inquisitor going into the fade at the end of Veilguard being an eternal "banishment" really interesting because at least for me I feel like it ignores what the ending is supposed to mean for Solas overall. Solas in Veilguard is finally at the crossroads in his life that some other Inquisition companions and advisors were at in DAI. I mention Inquisition specifically because for me his journey is so much more reflected and connected with them, his journey might take two games but it narratively fits so well within the scope of Inquisition.
Anyway as the player character, we are given the choice that will define the fate of these characters based on our emotions and logic and this will become the canon choice of that particular world state. For Solas, we aren’t told much information about his future and the results of his choice but we are shown it through visual motifs and more directly through the difference in the pair of remnants left behind by Mythal. We have the remnant that exists in the crossroads and has lived the last couple thousand years existing in a static state never leaving and never growing past her past. The other remnant existed inside Flemeth and we were told by Morrigan in Veilguard that this remnant was able to love and live many lives experiencing the world and living more fluidly.
Our choice is based on our opinion of Solas but the outcome is reflected in what it means for him and if your choice will have him continue the cycle and stay in a static existence without growth or go forward into a future full of new experiences, change and growth. If you fight him you are continuing the cycle of violence, leading to Solas to become as bad as the Evanuris and becoming static - stuck in his ways and as a result likely stuck in the prison of regret that he may never escape from because he refuses to grow. Thus Solas becomes like Elgar'nan and the other evanuris and Rook becomes like Solas in replaying the cycle of history of what happened when the veil was created.
If you trick him and best him fairly in a battle of wits, Rook becomes his equal, his proper opponent on the chess board rather than just a piece on Solas's board. The cycle breaks because Solas has to come to terms with the fact that he has lost, this results in change that is confronting for Solas but he takes it with grace and falls into a brighter future.
The last choice, the compassionate ending where Solas is able to confront his past but also be comforted towards the future by the Inquisitor, regardless of whether or not he romanced them will result in Solas actively and freely walking away from his plan and the game he has been playing against and with Rook. The cycle is broken, there are no winners or losers except the Inquisitor who vowed to change his mind and of course a Inquisitor who said that their love would endure. They are the winners here. (Obviously everyone has their opinions on if their love did endure for them personally so this is more so just me describing the facts presented in the game if that ending is chosen)
This ending is also representative of Solas finally reaching the moment that Cullen, Blackwall and the Iron Bull were able to reach where they could find themselves putting down their duty and moving forward with something new. All 4 of them are bound to some kind of organisation or duty be it the templars, the ben-hassarath, Blackwall’s duty to his lie and guilt or in Solas's case the revolutionary for his people. The other three in Inquisition were able to become something new, something in their heart they wanted to be but had to be confronted with the mortifying truth of facing themselves and following a new path. Solas doesn't get the exact clarity in his endings that these three characters get, however he does actively state that he will go to atone and then calm the anger of the blight.
He, like these other three and the remnant of Mythal that left their old lives behind, will now walk on a completely new path. So for me it felt incredibly clear that he would not be stuck in any way anymore because of this and being bound to the prison eternally would not even be an outcome on this path even if he is to go back there first. This ending is about completely forging something new for him, something that requires him to confront himself and accept himself entirely. And the Inquisitor is here as not a prisoner with him, but rather someone to join him on the path he is to take next.
So when people say the pair of them will make the prison into a home or just generally only seem to see a future for them in that prison by themselves I find myself compelled to ask why? Why would the ending that's about breaking the cycle and very visibly showing Solas making the choice for himself and freely walking into the future be one that leads to another eternal permanent state of being. It ignores the idea of what this ending means and I think focuses slightly too heavily on taking the ending slides just as face value.
The choices you make as the person holding the controller/mouse happen in tandem with what you didn't choose. So they all exist as possible outcomes and you can occasionally get more information from viewing other choices then just focusing on the one you made. When you are given the ending slide for the romanced Inquisitor that follows him into the fade we are shown them hugging, with Solas who has shed his armour and is wearing an outfit akin to what he wore when he was at Skyhold. Aka when he is at home, at rest. This ending shows him at rest with the Inquisitor and we are told they are reunited and their story has come to an "end."
Now it's easy to get tunnel vision and only view this ending and think oh they're just in the fade forever, but if you view the others, especially the ones for where you trick or fight Solas they specifically show Solas falling into the fade. This is important because it shows the direct result of your choice through how he enters the fade and is indicative of the future that will follow for him. In one we see Solas falling into darkness because the cycle of violence continues and in the other Solas falls into a brighter future because he accepts defeat. So for the romanced ending it's not representing their permanent state of being but rather showing us the direct result of Solas entering the fade in the same way the other two I mentioned are. He doesn't fall; rather he finds himself stable, standing up and able to accept the Inquisitor's love in an embrace in a moment alone. That's what he does first, not what they do for an eternity. In the non-romanced option he is actively walking to a brighter future with his staff in hand and dressed ready to approach his next challenge. This is likely what he will do next in the other future too just with the Inquisitor at his side this time but after he gets his bearings and they are able to move forward together.
When I see people say well what about the Inquisitor's life, why is she throwing it away for a man or what about her friends and family deciding that it's absolutely certain she will never see them again I am again compelled to ask why. They are entering a bright future together, and that bright future is defined by you ultimately. For one thing, time in the fade serves to be convenient to the narrative it is in. Rook was in there for a couple hours but in the real world weeks had passed which I assumed was because that was how long the group needed to make the dagger and successfully be able to free Rook. For the Inquisitor they spend hours in the fade in a quest and return within minutes because they were needed in the real world to make a choice about the Wardens that evening. So if you believe wholeheartedly that your Inquisitor would never abandon the world right now there's no reason why the fade wouldn't let them out in whatever time is most convenient for the imagined future for your character. Maybe the two of them spend weeks healing the anger of the titan's dreams and then return to this world in an hour. Let's not forget these are two people who rarely sit on their ass and just wait for the world to fix itself. The minute Solas was out of the prison he was out there in Minrathous fighting Elgarn'arn and Ghila'nain whilst protecting the people of the city. The Inquisitor is helping lead the efforts against the blight in three different countries based on their letters so why wouldn't either of them join the forces to help the world heal. Neither of them understand rest truly, so this moment of love together with them is likely just a quick break in between making their next steps.
In terms of where they end up, I personally believe any ending that shows Solas entering the golden part of the fade indicates both a brighter future for him but means he will not enter that prison again. There is no need to, the prison is figuratively a representation of Solas being trapped by his regrets and unable to move forward so when he walks forward into a new future this prison now has no hold on him. Even when he is tricked, I think accepting defeat is enough to free him. He would just need longer to find his bearings and move forward but still would not need the prison anymore. We see light in these endings and the only places that are bright and full of light in the fade are the Dread wolf’s crossroads and the lighthouse so most likely he is returning to one of those places. Especially when in the non-romanced compassion ending he is dressed differently and has his staff he would need to acquire from the lighthouse. The Black City is also the closest I’ve ever seen it when viewed from inside the crossroads so it would make sense for him to reach it from there.
To end this very long post I will say that even though we aren’t told exactly what happens to Solas and the Inquisitor in the end I will stand by the fact that this game isn’t telling us they are banished to be alone in a prison forever. The game doesn’t tell us everything in words, rather it frequently relies on themes, imagery, actions and our own interpretations to make up the rest however so much is said to us and I wanted to write it all out somewhere for my own sanity really.
