KMC Forums - Emerald Weapon

Emerald WEAPON is an optional boss in Final Fantasy VII and one of the toughest of the four WEAPONs to defeat (the others are Ultimate, Diamond, Ruby and the non-battled Sapphire). It is one of the creatures that Sephiroth sends out of the Northern Crater to cleanse the planet of humanity.

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Emerald WEAPON is located under the ocean, accessible by the Submarine. A battle will ensue after making physical contact. You'll have 20 minutes to complete the battle unless you have the Underwater Materia equipped.

One of the things that makes Emerald one of the strongest of the WEAPONs is its Aire Tam Storm; this caused fans no end of trouble when they first played through Final Fantasy VII, but the clue is in the name of the attack. "Aire Tam" is actually Materia spelled backwards, which suggests that the attack has something to do with the party's equipped materia. It turns out that the attack deals damage to each character equal to the amount of materia equipped on them multiplied by 1111. As such, having nine materia crystals or more equipped on a character meant certain death. Honing of strategies has resulted in the widespread defeat of Emerald, as players have learned to make the most out of as small an amount of materia as possible.