Lords of the Abyssal Council can only be summoned through the greater wind stones, and only the top ranking members of the Twilight's Council may speak to them. But... I have found a way to upgrade your disguise and fool the Abyssal Lords!
The disguise calls for a ring of lordship, worn only by the highest members of the cult. I will craft one for you if you can bring me large brilliant shards and abyssal signets.
May fortune go with you, <name>. Speak with Aurel when you are ready.