Defeating Acererack

The party seeks to defeat Acererack, but they do not know where he is. To find out this information they must engage their deal with Gazra. While they were helping Gazra with an errand so he could find Acererack for them they met Sog'thannok.
Sog'thannok also had some information for them; a metal they could use to defeat Gazra, as well as a patron of Sog's, Orgreg, could be found in the Pit Jail of Avernus.