Yes! An update. We can postpone the coffin dance.

I rather like this alteration. It bothered me that both of them would be obsessed to the point of being willing to see lives destroyed (or to burn the whole world, as Celestia stated) just to have their non-immortal love back. One I could see, but it stretched it for me that both would be that willing to harm ponies. An immortal should be more capable of waiting for them to be reborn naturally, in my opinion. And I agree that Luna, both with the suddenness of the reveal, and with how much more the consequences matter to her, especially with this wrinkle you've thrown in to the mechanics of dreaming, definitely should not be willing to accept what has been done.

Additionally, I believe that in canon (I never actually saw the episode), Luna held both Honesty and Loyalty during the fight with Discord, so her dream responsibilities, and her nature as embodied by the Elements she once held, would make what is happening anathema to her. Maybe she'd be able to accept it at some point if it were still allowing the displaced souls to be reborn properly, but as is, no way.

Pretty good story so far keep up the great work can't wait to read more

Small edit nitpick:

dined

in Sombra's journal should be:

deigned

The changeling willingly did something below its dignity... it didn't eat it. ;) Looking forward to the next chapter.

Oh cool I thought this was big dead. And with better characterization (IMO) too!

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Add to that the fact that in this latest case, Luna was the one who facilitated the theft, and did it forcibly, against Twilight's wishes, and there'd be a lot of guilt there.

Frick. I read it all in one night. I want more!

You could use more description in your work to add length and immersion. How do the characters feel? Describe the physical symptoms of emotion. Describe the environment. (Example the court room is a white void with the default dark oak witness stand and generic tables.) Now don’t spend a paragraph describing the table unless its a very important table.

Good story idea though!

Luna's title and position kind of put her in a position where no matter how you slice it she and Soul Shadow are enemies. I should also note that years of abuse of the system seems to have warped Shadow's soul noticeably and the princesses can't seem to see it, possibly because of the infrequency of their meetings.

Now I'm imagining the court. "Twilight Sparkle to the stand." *Ghostly body of Two appearing on the stand and starts saying how she's trapped in a pocket dimension with 33 others.*