Avacyn - durability + vs Grislebrand

Avacyn and Griselbrand battled for days, out of view of all but Avacyn's host; the Lunarch, Mikaeus; and his most trusted bishops. Finally, in an act of desperate effort, Avacyn used all of her remaining strength to drive Griselbrand into the Helvault. As his final act, Griselbrand threw his spear and impaled the archangel's heart. The binding spell backlashed as she was impaled, and Avacyn was drawn into the Helvault herself.

Innistrad's most powerful demon was now encased in a great silver mass, as was the archangel Avacyn herself, keystone of the Church and protector of humankind. The words of her own spell imprisoned her: "What cannot be destroyed must be bound."


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THE PRISON OF SILVER