With all four Huge Materia quests complete, pilot the Highwind to the Cosmo Area and head for Cosmo Canyon. Visit the Item Store and you'll discover the passage to the right of the counter is no longer roped off. Proceed to the back room to pick up an ELIXIR and a MAGIC SOURCE and grab the FULL CURE MATERIA from the bed. Meet Bugenhagen in the Observatory and he'll indicate he'd like to visit the Forgotten City. Before you depart, Bugenhagen will take whatever Huge Materia* you have and store it in his lab. Return to the Highwind and head for the Forgotten City. Take the left path and escort Bugenhagen to the large structure housing the mysterious ancient device. Head right along the upper walkway and down the stairs. Approach the glowing object suspended in the middle of the hall and Bugenhagen will send you to find a key hidden somewhere 'even sunlight can't reach.' Go back to the Highwind head for the Shinra Sub. From Junon, take the Sub north along the eastern perimeter of the ocean floor, pass through a narrow canyon, and locate the hidden tunnel that will take you east under the Northern Continent. When you reach the area roughly beneath the Forgotten City, you'll find a strange-looking object, the KEY TO ANCIENTS. When you return to the Forgotten City and give the Key to Bugenhagen, he'll use it to activate the Ancient Music Box. When you've learned all you can from the ancient device, head back to the Highwind. As you're about to board the airship, Diamond Weapon will rise out of the ocean and begin advancing toward Midgar. Head for the beach north of the city and prepare yourself for the upcoming fight. Battle Diamond Weapon then inspect the damage at the Northern Cave. When Cait Sith contacts you and his true identity is revealed, fly the Highwind over Midgar and your party will parachute into the city.

STRATEGY


Diamond Weapon:
Diamond Weapon frequently uses a Fire-based attack; protect yourself against Fire ([Fire-element]-[Elemental], Fire Armlet, Tetra Elemental, etc.). Its most devastating attack is the Diamond Flash, which inflicts heavy damage to your entire party and can cause Silence. Consider equipping Ribbons and/or [Seal or Hades]-[Added Effect]. Open with Big Guard and Regen, then steal the RISING SUN as soon as possible. At the beginning of the battle, Diamond Weapon will be immune to physical attacks. For the moment, use strong magic such as Ultima, Contain magic and Comet. When it opens its chest cavity and begins the countdown to Diamond Flash, its immunity will switch from physical to magic attacks. Make the appropriate shift in your tactics, and you may be able to defeat the creature before it has the chance to attack.

*NOTES




Huge Materia:
If you have acquired both the Bahamut Materia and the Neo Bahamut Materia, approach the Blue Huge Materia and you'll receive the BAHAMUT ZERO MATERIA. Approach the Green Huge Materia when you have a mastered set of all 21 Magic Materia and perform a Materia Blend to receive a MASTER MAGIC MATERIA. Approach the Yellow Huge Materia when you have a mastered set of Manipulate, Deathblow, Morph, Throw, Sense and Steal Materias and perform a Materia Blend to receive a MASTER COMMAND MATERIA. Approach the Red Huge Materia when you have a mastered set of all sixteen Summon Materia and perform a Materia Blend to receive a MASTER SUMMON MATERIA. Performing a Materia Blend will require you to sacrifice all the corresponding mastered Materia. Your compensation will be the capacity to enjoy the abilities of all the lost Materia by equipping a single Materia. In the case of the Master Summon Materia, an additional benefit will be the capability of summoning any monster an infinite number of times per battle (providing you have enough MP, of course). Go to Cosmo Canyon with Red XIII in your party at any time once you've neutralized the threat Diamond Weapon poses to Midgar. When you visit Bugenhagen in the Observatory, he'll present you with the LIMITED MOON.



OPTIONAL QUEST:
The Weapons