The Chosen Five
A mad priest of the Demon Lord Orcus and the leader of the Death Cult. He was planning to sacrifice Sariah in an attempt to tear open a rift to the Shadowfell. He was very close to success when he and his plans were cut short by The Guardians of the Gate.
Upon his death, the Shadowfell Rift shimmered and the PCs got their first glimpse of The Chosen Five. After a brief confrontation, The Chosen Five used the Thing in the Rift to grab Kalarel and drag him into the Shadowfell.