Location 1: X-13 Y-58.
These are the ruins Sin dropped you in at the very start of the game. You can go and kill that Geosgaeno monster from the start of the game and if you have found all six destruction spheres through the game you can go in the temple and get Anima as a summon.
Location 2: X-30 Y-73
This will lead you to the bridge directly under Besaid Falls and will get you the weapon Dragoon Lance.
Location 3: X-35 Y-58
This will land you on a structure far out in the sea. There is one treasure chest containing the weapon Sonar.
Location 4: X-42 Y-57
This will land you in the crater formed by Sin at the battle at Mushroom Rock. There is one chest containing the Phantom Bangle.
Location 5: X-15 Y-42
This will land you somewhere in Bikanel and there is only one treasure chest containing the weapon Ascalon.
Location 6: X-74 Y-35
This is the Omega Ruins. In every FF game the word Omega means trouble. These ruins are filled with the most powerful enemies in the game. This place twists around everywhere but dont forget to get the Al Bhed Primer 26 (the final one!). There are two bosses in this place which are the hardest in the whole game...
BOSS: Ultima Weapon
Get your aeons overdrive filled before this battle. Send out the Magus Sisters and use there overdrive. If that doesnt kill it then keep attacking until it dies.
BOSS: Omega Weapon
Omega weapon is similar to Ultima weapon but has a lot more hp and has better attacks. Like before, make sure you have your aeons overdrive bars filled and ready for battle. Send out the Magus Sisters and use their overdrives. This may not kill Omega weapon so keep attacking. If the Magus Sisters are defeated send out Anima and use its Overdrive and then keep attacking until Omega Weapon finally dies. You will get great rewards for defeating these two including many level 3 and 4 Key Spheres, and a few weapons.
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