After getting past Diaanja's ward, you meet Mishirla. He tells you he has been scouting Khormynth but is now ready to face Diaanja.
Let's go down there!
I have returned from exploring Khormynth's power base. I notified the zombies in the camp and immediately came here to help you. We don't have time for explanations. Let's go down there first. I can't wait to meet Diaanja.
Go down the steps and this quest is complete.
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