This quest is only available to characters of evil alignment. Good aligned characters should complete A Split in the Ashen Order instead.
You must have at least 30,000 faction with the Ashen Disciples to obtain this quest. It is not necessary to complete the preceding quests in this timeline such as Diplomatic Liaisons.
To obtain the required faction without doing the quest line, you can kill Ashen Order monks around T'Narev. If you are in a group, killing groups of Ashen Order monks will raise your faction with the Ashen Disciples much faster than completing the repeatable quests offered by Shing Ho.