Archcanon Tholer Saryoni asked me to bring him the Ebony Mail. The Ebony Mail can be found in Mount Assarnibibi where Molag Bal oversaw the 99 lovers of Boethiah that gave birth to Almalexia. Mount Assarnibibi is north of Molag Mar.
I received the Ebony Mail from the shrine at Assarnibibi.
Saryoni thanked me for bringing him the Ebony Mail, but said that I should keep it and do good deeds. I am the new Archcanon of the Temple.
The quest is marked as complete after obtaining the armor, even if it is not taken to Tholer Saryoni as requested.
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