The quest is supposed to start with a Deathguard Elite in the entrance of Orgrimmar which then sends me to meet with Liliana and Callia. But the character who is supposed to be in the entrance of Orgrimmar is currently gone.
Apparently the quest can also be picked up from Valdrakken which is a zone I haven’t yet visited. But before tonight’s patch, the Deathguard Elite character was in the entrance of Orgrimmar and now it’s gone.