Faded Abyssal Crest

Faded Abyssal Crest was used to increase reputation with the Cenarion Circle.

Source
Abyssal Crest drops off Abyssal Templars in Silithus.

As a quest objective

 * Medallion of Station
 * Abyssal Contacts
 * Abyssal Crests
 * Dukes of the Council