Griselbrand

Griselbrand is one of the demonic masters of Liliana Vess. He lived on Innistrad, a plane very similar to Earth in its Gothic ages. He fought archangel Avacyn, which resulted in her disappearance. Currently, he is imprisoned in the Helvault, an artifact of immense power, made of pure silver. Immediately after his release, Liliana tracks Griselbrand down and uses the veil to kill him permanently.