Find an old map of Tunaria ( 537, 123, -66 ) Copy/waypoint 537.33, 123.12, -66.35 (in the Sanctum) and bring it to The Duality.
Go out from the Sanctum and find a sample of roekillik fur in the Roekillik caves (Entrance at ( 1484, -116, 3062 ) Copy/waypoint 1484, -116, 3062 look for the sparkling crystal just inside the entrance) in the Sundered Frontier ( 1405, -129, 3078 ) Copy/waypoint 1404.99, -129.49, 3077.74.
Return with the fur to The Duality to receive the recipe for a Roekillik Illusion, then craft the disguise.
There is an engraved desk in the Sanctum ( 525, 130, -59 ) Copy/waypoint 524.66, 130.09, -59.35.
Enter the roekillik caves and find the private lair at ( 1384, -134, 3051 ) Copy/waypoint 1383.95, -134.07, 3050.61
Once inside the lair, use one of the crafted illusions
Talk to the Roekillik Elder at ( 1102, -295, 3384 ) Copy/waypoint 1101.76, -295.10, 3384.49to complete the quest.