Zho Heishan tells you, "Excellent, perhaps you can help me. My superiors seek some knowledge of the troubles affecting the ley lines of Dereth, and the problem seems to trace back to Rytheran, the ancient Dericostian noble. We have become aware that a path into Rytheran's current abode within the ruined Gardens of Menilesh has opened somewhere in the Empyrean Graveyard."
Zho Heishan tells you, "Find a way to seek out Rytheran and see if you can retrieve his personal mnemosyne... We need access to his memories about the reading of the Book of Eibhil. It may not be necessary to destroy the undead lord, but merely to attain his cooperation."
Zho Heishan tells you, "You have already taken on this task on behalf of Nuhmudira's agent, that barbarous woman Lacarra. I do not think we can cooperate."
Zho Heishan tells you, "I've already asked you to journey to the Empyrean Graveyard, find the way in to the Gardens of Menilesh and seek out Rytheran's mnemosyne. Please, there is little time to waste."