Avacyn’s final words suggested a solution: what could not be destroyed must be bound. The Helvault had been made from Innistrad’s silver moon, so Tamiyo prepared a spell able to turn the larger body into a prison. Nissa supplied what power she could draw from a plane that resisted her touch.
Jace attached the binding to Emrakul while Gideon, Chandra, Liliana and their forces held the shrinking perimeter. Tamiyo opened a scroll whose original contents promised devastation. The spell that emerged was different. Emrakul had reached through Tamiyo and changed the story being read.
The titan folded into the moon and a glyph marked the seal. Innistrad survived, and Liliana joined the Gatewatch under terms tied to her remaining demons. Tamiyo understood the unresolved cost: Emrakul had chosen confinement because the time was not yet right. The defenders had won the day without owning its final meaning.