The Altar of Zanza can be found on Yojamba Isle, a small island northeast of the Vile Reef, in Stranglethorn Vale. [13.4, 15.1] You'll need this to destroy bijous.
We call upon you, Zanza of Zuldazar.
Bless those that ask for your help, Loa Zanza. Bless those that would ally with the Zandalarian
Aid us in this time of need. Aid us Loa. Give us the power to strike down our enemies. Give us the power to once more defeat the Blood God.