You found a strange necklace in a jewelry box that Pazuzu dropped. Take it to Charna, a Preceptor of Sorcerers and Spiritmasters.
Step 1. Take the necklace to CharnaPreceptor of Sorcerers and Spiritmasters. She is in Protectors Hall of Sanctum..
Noble Nephrite Abyssal Necklace
Noble Jadeite Abyssal Necklace