Qiraji Magisterial Ring

Qiraji Magisterial Ring is a Cenarion Circle armor token. It can be exchanged along with various idols and scarabs at various NPCs at Cenarion Hold for the following items:
 * Signet of Unyielding Strength
 * Ring of Eternal Justice
 * Ring of the Gathering Storm
 * Band of Vaulted Secrets
 * Band of Unending Life

Source
This item drops from all bosses in the Ruins of Ahn'Qiraj.