Ormendahl

Ormendahl is a demon prince from Innistrad.

Storyline
Ormendahl is among the more powerful demons released from the Helvault, he survived Avacyn's purge by hiding in caverns deep beneath the cathedral. After Liliana Vess killed Griselbrand, he took the other demon's place as the leader of the Skirsdag cult.

Unfortunately for the innocent victims of the Lunarch Inquisition, the fractious council of bishops was highly susceptible to malignant influence. Bishop Jerren, who sat on the Lunarch Council, was Ormendhal's high priest and used the uncertainty of the council to whip the church into an even more violent frenzy.

Shadows over Innistrad
After escaping his imprisonment in the Helvault, Ormendahl began spreading terror across Innistrad. He possessed a cathar's wife, causing her to commit a string of murders that would be blamed on werewolves. The possessed woman was discovered and killed, but not before she revealed that Ormendahl was the one responsible.