I’m going to wager that, Xavier being Xavier; he probably backed up Arakko as soon as it moved to this dimension (without their knowledge or consent)
Oh, thanks! Now it makes sense. Although it is still weird why other people in Great Ring don't mind what Isca and Tarn have joined them after being enemies for thousands of years. Guess they have the same "amnesty of past crimes" like Krakoa. Also curious, whom they killed to take their seats.
I bet you could kill Isca with a well placed catch 22. Schrodinger's cat would probably make her head explode.
"A happy ending? So unlikely. We're not having a moment here.
Wrong city, wrong people, all huddling in fear.
No one escapes the slaughterhouse, and that's just where you're at.
(You could've asked Rebecca but then Adam stomped her flat.)
You think you're special cuz you're scrappy? You're deluded, time to go.
Lucy's living on the moon but you're another dead psycho."
Checked X-Men #13, Isca switched sides even before Arrakko went to another dimension. When Genesis and kids left Apocalypse on Earth, Isca was already on the side of Amenth. So, Isca was an enemy from the very start. And according to X-Men #12 around 200 years ago she returned to Arrakko to summon Genesis to Amenth, where she became Annihilation.