On a serious note: I think you've done incredibly well with this take on Arthurian myth -- and I am always a ho for Arthurian myth LOL.
[WARNING: SPOILERS]
I love the theme of parents as people in this. Like, obviously Uther comes off as plain evil and Igraine as an angel, but considering they've both passed by this point, that's to be expected. The rest of the cast is wonderfully complex. In particular, the way you wrote the relationships between Morganna and Junia and Accolon got me.
The easy thing to do would have been to write it so that neither Junia nor Accolon knew that Morganna had raped Arthur, and for them to abandon her upon learning of this. Most of the time in real life, it's a lot harder to abandon someone you love, even when you know they've done something horrible. Mordred and Gareth continue to love their mother because they're children and children tend to be fiercely loyal to their parents. Accolon and Junia do it because they know how good Morganna can be, if only she would step off this path she's taken.
Junia standing up to Morganna was beautifully done. She saw her sister was falling apart and made the incredibly difficult move to stop coddling and enabling her bad decisions while still being sympathetic to the reasons behind them. Morganna has lost so much, and the only way to stop a full-on meltdown is to show her that there is yet more to lose if she continues. A wonderful example of "I love you enough to lose you."
And the way you've addressed trauma! Morganna and Arthur are absolutely adults who've made mistakes and need to correct them. But on another level, they are also still "stuck" as traumatized teenagers, visible in Arthur's timidness and Morganna's rage. Just a couple of scared kids. Lancelot appears to fall in here as well (I imagine he's been through some hell and that Morganna's attempt to drown him as kids hasn't helped). These three, contrasted with calm and mature Kay and Accolon, have a lot of pain to work through. You can see it in their parenting as well: Gareth, Galahad, and Mordred (if one chooses to play them as such) are all terribly mature and grave for children their age. Meanwhile, Gawain has far more childlike tendencies because Kay and Hilde Alistair didn't pass down trauma to him.
Lot and Uther create your hard line of what a horrible person is, while characters like Kay fall firmly into "good," allowing everyone else to exist and move along the spectrum of "trying their best."
A final note: while I have been reading Morganna as a tragic villain (not sure if that was your intent?), I believe you have done her character justice. She is not insane, or evil for evil's sake, but rather someone who has stepped off a precipice and not reached the bottom yet.
Beautiful work.