Kistenian told you that the Magic Flame Wards he casts are weaker than they should be. He thought the ghost of Priest Esekiel was interfering with his work. He asked you to send Esekiel back to the flow of Aether and to take the powerful Frozen Orb from her. When you brought the Orb to Kistenian, he was intrigued by it and wanted to send it to Pandaemonium for study.