A giant red sphere the at keeps Utopia, and by proxy, all the X-Men trapped inside. As well as surrounding areas of San Fransisco.
This sphere is…well, indestructable, because when the Avengers show up even Thor can’t hammer-smash it into obliteration.
The sphere turns into a portal and beings to release an army of Nimrod’s in to slaughter the X-Men.
It’s not a pleasant sphere.
