Bishop Jerren was a Human cleric from Innistrad (plane).
Background
Jerren was part of the Lunarch council but in truth, he was a leader of the Skirsdag cult, worshipping the Demon Ormendahl.
Midnight Hunt
Two years after the Travails, Jerren became involved with the Heron's Grace Orphanage where he would verbally and physically abuse the young boys in his care. He was killed by Tim, one of the orphans, who got transformed into a werewolf by a strange woman who worked as a doctor at the orphanage.