This is how Starlight, Trixie, Thorax, and Discord vs. Von Nebula goes in To Where and Back Again Part 2.
[Starlight, Trixie, Thorax, and Discord find themselves in a black hole]
Starlight Glimmer: What the...?
Trixie Lulamoon: A black hole?
Thorax: Where did this come from?
Discord: Maybe from Von Nebula.
Von Nebula: [offscreen] Very clever.
[Von Nebula appears]
Starlight Glimmer: Well, if it isn't Von Nutcase.
Trixie Lulamoon: What does he want?
Thorax: I don't know.
Discord: Our magic most likely.
Von Nebula: You four won't be so clever when I begin draining your magic and use it as dark energy.
Starlight Glimmer: So that's your game.
Trixie Lulamoon: Like that would ever happen.
Discord: Forget it.
[The black hole starts pulling them down]
Von Nebula: Your precious magic will enhance my black hole ten thousand times.
Starlight Glimmer: What?!
Trixie Lulamoon: What kind of fool do take the Great and Powerful Trixie for?
Thorax: Not to mention me and Discord.
Discord: We can resist it you know.
Von Nebula: It's hopeless. You can't resist indefinitely. But I'll enjoy seeing which of you surrenders first.
[Von Nebula disappears]
Starlight Glimmer: Yeah.
Trixie Lulamoon: Yep.
[Von Nebula reappears]
Von Nebula: I assumed your fancy Alicorn Amulet had been stripped away with your devices. Lucky I've been monitoring you. I will take that amulet now.
Starlight Glimmer: You can try.
Trixie Lulamoon: If you can figure out which one of us has it.
Thorax: Take your pick.
Discord: Come on.
Von Nebula: You forget that Twilight and I go way back. She was the one who finished me.
Starlight Glimmer: Then take your shot.
Trixie Lulamoon: Come at the Great and Powerful Trixie.
[Von Nebula fires at Starlight and Trixie, who dodge the attack]
[Thorax and Discord throw the Alicorn Amulet into the black hole center]
Von Nebula: No! Twilight is always the one! Always first!
Starlight Glimmer: Yeah. Right.
Trixie Lulamoon: Now we will be rid of you forever.
Thorax: Go for the staff.
[Von Nebula goes to lung at Thorax and Discord, but Starlight and Trixie grab the staff]
Von Nebula: No, stop! You'll destroy us all!
[But they ignore him and suck him in]
Von Nebula: Noo!