The Ancients' Machine and Diamond Weapon

Go to Cosmo Canyon and up to Bugenhagen's observatory. There, Bugenhagen will store the huge materia that you've collected so far. If you have Bahamut and Neo Bahamut, you can examine the blue one and "get closer" to recieve the Bahamut ZERO.

Bugenhagen will join you aboard the Highwind. Head back to the Forgotten Capital north of the Bone Village and take the left path at the 3-way fork. Head to the chamber at then end of the path where Bugenhagen will examine the machine there. It makes reference to a key somewhere that "sunlight can't reach".

Leave the city and go back to the Highwind. Land where you parked your sub and board it. Dive down and head southwest until you find the wreckage of the red sub in the middle of some undersea greenery. You'll recover the Huge Materia (red).

Head all the way north until you come to a small cave on the right. Inside you'll find the Key to Ancients. Return to the Forgotten Capital and go back to the strange machine. Bugenhagen uses the key and the machine reveals that Aeris summoned Holy which will stop Meteor, but Sephiroth is blocking it.

Leave the city again. Just as you're about to board Highwind again, a new weapon shows up and heads for Midgar. Land at the beach north of Midgar and wait for it. When the Diamond WEAPON arrives, you can fight it or let it go. If you fight it, it still keeps going anyway but you'll get a ton of Exp, AP and Gil. Shinra fire their huge cannon at it, but not before it fires on them. The cannon blasts through the Weapon and blows away the barrier over the crater protecting Sephiroth.

Head north to the crater to check it out. Before you can do anything however, Cait Sith reports that Hojo has taken control of the Sister Ray and is trying to fire it again. However, it is too soon and the resulting overload will destroy Midgar unless someone stops it.

Obtain: Enemies: