Zirconiade (ジルコニアエイド, Jirukoniaeido?) is the final boss of Before Crisis -Final Fantasy VII-. A so-called "Ultimate Summon" also called the "World Burner", Zirconiade's pyramid-shaped summon materia is so powerful it needs four support materia to be fully summoned into the world, which were hidden around the planet long ago.

Fuhito, Avalanche's demented scientist and former apprentice to Bugenhagen, seeks the support materia. He plans to summon Zirconiade to eradicate all life on the planet, returning all the world's spiritual energy to the lifestream so the planet could heal from the influence of the Shinra Electric Power Company.