Enter the portal and find Rilgor within the city of Ak'Anon. Click the portal Gabblin creates to zone your entire group into Rilgor Plegnog's Chambers.
Hail Rilgor Plegnog. At the end of the dialog, he will become aggro and turn into a 82 ^^^ heroic.
Kill the aggro Riglo to retrieve the Shining Metallic Robe.
Return to the portal in Antonica ( -978, 11, 714 ) Copy/waypoint -978, 11, 714 and give the robe to the enchantress. As before, the zone will have respawned.