SPOILER WARNING: This article contains spoilers for "Extraordinary X-Men" #16, which is on sale now.
The battle continues to rage on, though, as the World-Eater's power is unloaded in close proximity to the Jean Grey School. The massive display damages the structure, ripping chunks of it off.
Illyana does the only thing she can do to prevent X-Haven and all of its inhabitants from being destroyed: she kills the World-Eater's host, Sapna.
Three days after Sapna's death, Storm states that she knew they would lose someone eventually. The battle they were fighting -- against the M-Pox, Apocalypse, the World-Eater, everyone -- was too intense. But in the wake of Sapna's death and the destruction of large chunks of the Jean Grey School, Storm labels her mission a failure.
Now, it's time to move forward -- and out of Limbo.
The X-Men can no longer safely stay in Limbo, and Storm is ready for the X-Men to reclaim their place on Earth "one way or another." This development dovetails nicely with a few other recent developments in the X-Men line, which all seem to be pointing to spring 2017's ResurrXion relaunch.
First, the recent "Uncanny X-Men Annual" provided a possible solution to the M-Pox in the form of the mutant healer Elixir. His powers have proven effective at healing the victims of the Terrigen mists on a large scale, although he's still learning to control them. Then there's "Inhumans vs. X-Men" #0, the prequel issue for the next major X-event. In that issue, Emma Frost reemerges and approaches Storm with a plan to combat the Terrigen cloud. Considering Storm's decision to take action and make Earth habitable again no matter what, it seems like she's probably in a place to hear Emma Frost's still mysterious plan.
"Extraordinary X-Men" #17 -- the first chapter of the series' tie-in with "IvX" -- arrives in stores on December 28.