Climb up the wall at ( -648, 8, 109 ) /waypoint -648, 8, 109 or ( -621, 8, 109 ) /waypoint -621, 8, 109 and jump down into the Pool of Immortality at ( -634, 3, 160 ) /waypoint -634, 3, 160. Once on this central rooftop, slay all mummies to spawn Flowmaster Utat. Kill Flowmaster Utat to spawn the Sul Priestess of the Fyr'Un.
You may have to clear the mummies several times to spawn Flowmaster Utat.
You may have to slay Flowmaster Utat several times to spawn the Sul Priestess of the Fyr'Un.
Slay the groups of mummies in front of this location. Each group will drop an urn that is to be placed in the triangular area circled in the picture below. Only place a single urn in the triangular area. The urn will despawn and either Rin Priestess of the Fyr'Un and two offering retrievers will spawn, or just the retrievers. They will often despawn if not attacked immediately. Respawn on the groups that drop the urns is ~5 minutes.
Approach the stone statue along the aqueduct in the Statue Court at ( -153, 25, 365 ) /waypoint -153, 25, 365. This will trigger the statue to spin around, allowing you to travel across to the other aqueduct. Enter the Silent City at the end of this aqueduct to complete the quest. ( -7, 30, 480 ) /waypoint -7, 30, 480