Dirge of Cerberus Omega Weapon

2003 years ago, a calamity fell from the skies. Heavens dark harbinger...Jenova.
With the onslaught of Jenova, the planet created 7 WEAPONs to protect it. Of the seven, six of these massive creatures were created to destroy any malevolent intruders. However, before they could do anything, the Cetra managed to seal Jenova away in the Northern Crater. WEAPONs were then sent into a hibernation-stasis, until they were needed again.
Almost 2000 years later, the first of the WEAPON was accidentally awaken. Jade WEAPON was destroyed by the Turks. It was not clear at the time what this beast was, or its purpose. But it would not be long before the whole world found out.

When Cloud handed Sephiroth the Black Materia, it was then that the planet knew it was in danger. It awakened the other five WEAPON. Sapphire, Diamond, Ultimate, Ruby, and Emerald WEAPON began destroying anything posing a threat to the planet. Sapphire was destroyed by the Sister Ray in Junon, Diamond WEAPON was destroyed on the Midgar shore. It was thought that Diamond Destroyed President Rufus in the crossfire, but that was later proven false. Cloud, and the rest of his group destroyed the other WEAPON, and managed to stop Sephiroth. There was no need for the final WEAPON to be awakened, and fulfill its role.

Hojo found out about the final WEAPON in some reports from Professor Ghast. When Cloud defeated him in Midgar, he sent his memory into the net. His goal...to awaken Omega WEAPON, and destroy the world utterly.
Omega WEAPON is not a warrior type, as the others were. Its sole purpose is to collect the lifestream and find a new home, if there was no other way to save the planet. Hojo discovered that if enough innocent people were returned to the planet, the planet would be tricked into summoning Omega. His plan was set out. Lucrecia knew of these things as well, and knew the only way to defeat Omega was Chaos.She also knew that you would need the Proto Materia to summon Omega. She did not want that type of an object to fall into the wrong hands. She placed these two things into Vincent, hoping it would also save his life. When Omega was summoned, it was up to Vincent to prevent it from completing its task. In a earth-shattering battle, Omega was prevented from leaving the planet with the lifestream, and the world was saved once again.