Destroy 12 Void creatures and collect their marks (auto update). For example kill the Voidbeasts around ( -423, 459, 335 ) Copy/waypoint -423, 459, 335
Return to Fyr'remd Lorak.
Venture into the Library of Erudin and obtain the tome from the guilty Primarch (the final encounter of the zone).
Note You must do the murder mystery in order to get the update. You must answer the questions correctly. See The Mystery of the Slain Scholar.
Enter The Temple of Anashti Sul's at ( -944, -229, -1041 ) Copy/waypoint -943.94, -229.02, -1040.76 From Sinking Sands, and summon her by clicking on the raised bath at ( 0, -13, -99 ) Copy/waypoint 0, -13, -99.
Note: The cave to the backdoor entrance of Silent City is at ( -876, -235, -1261 ) Copy/waypoint -876, -235, -1261. This is also the entrance for The Temple of Anashti Sul's. Being in a group may prevent this option from showing up, and since only the person who summons her will get an update, everyone on this step should drop group and go in solo to get their updates.