Lb6 is a story about fate. Specifically it's a story that asks: if fate is set in stone, if your nature is immutable, if the outcome cannot prevented, what now? If a knight came from the future to give you undeniable proof that your plan would fail, what now?
Do you indulge in your worst vices? Do you try to fight against them? Do you struggle against your destiny, or embrace it? Is it truly wrong to bathe in your base instincts, when this is what the world wants you to be? Is there any meaning in trying to fight against them, if you will be made a monster either way? Do you blindly obey to your nature, do you try to understand it?
Can you say that none of it matters? Yes everything is fucked everyone is doomed it was all written from the start nothing you could have ever done could have saved a single person. But can you honestly look at me in the eye and tell me none of it mattered? There is a girl who has known nothing but pain her entire life, and though she does not have a single memory she can truly call happy she got to hold hands with someone she loves. Did that truly not matter? There is a girl whose personhood has always hung by a thread yet she had a brother she loved enough to remember him even as a heartless machine. Did that not matter? There is a girl who was betrayed by everything she has ever held dear, but even if only once she got to smile. Did that not matter? No, it could have never ended well, but does that mean it would have been better if none of this had ever happened at all? Is there no meaning to these little joys these people fought so hard for? Look at me. Look at me. Did it not matter?
This is what causes Oberon's rage too. Yes, Oberon is very much the main orchestrator to that ending, he’s also the embodiment of the absolute rage at the implications that because this story was a tragedy it would have been better to not tell it at all. Every story has to end, yes, but that does not mean it wasn’t real. That doesn’t mean it didn’t matter. Oberon is furious at panhuman history, at shakespeare, at the story, at you, the player, for daring to imply there was no point to this since there was no way for it to end any way but in blood.
Interestingly enough, Morgan is the one character who managed to completely dodge her fate. It came at the cost of having the most miserable life I have ever laid my eyes upon, but fact is she was sent here to destroy Britain, and until the very end she dug her heels into the dirt and said No. Fuck that. I will save Britain, or I will die trying. She said that was the hill she would die on, and then she did.