Quest: Return to Honor Hold
ID: 10903

When you complete this quest, the NPC should say these 2 things:

Assistant Klatu says: I fear that Colonel Jules may only be saved through a dangerous ritual... an exorcism.
Assistant Klatu says: Speak with me, <name>, for we have much to prepare...

http://www.wowhead.com/npc=22430/assistant-klatu
https://youtu.be/UIiFJf4wQuk?t=63
https://youtu.be/CgARfgAJdvI?t=56