Great Enlightenment

The Ori crusade is the holy war that the Human followers of the Ori waged against the races of the Milky Way to convert the galaxy to Origin.

History
The crusade began at the Battle of P3Y-229. At the activation of the Supergate, the Ori Army sent four Ori battlecruisers through it as a first wave. It battled two 304s, one O'Neill-class ship, and a fleet of Ha'taks from both the Free Jaffa Nation and the Lucian Alliance. However, their efforts were unsuccessful, as the Ori shields were too powerful for their weapons to pierce. When the battle ended, Vala Mal Doran, on one of the ships, gave birth to her daughter Adria, and learned that she was Orici, an Ori in human form intended to let the Ori lead the Ori army without enticing the Ancients

After leaving the system, the Ori fleet travelled to Chulak, for reasons which are still debated. One ship landed planet side to launch a ground invasion, while the other three remained in orbit. Bra'tac brought three ha'taks to try and defend the planet, but they were destroyed. Over the next week, the Ori conquered six more worlds, including two Jaffa strongholds.

In a plan to seal the Supergate, SG-1 travelled to Atlantis to cause a jump with a black hole, as well as locate the Sangraal, a weapon Merlin to kill the Ori. While there, Daniel Jackson met the Ascended Ancient Morgan Le Fay, who told him of Merlin's intentions, and that she had taken the Sangraal and hid it on one of three worlds: Castiana, Sahal, and Vagonbrei. however, the Others prevented Morgan from telling him anything further. The plan to cause the jump eventually worked, and also resulted in the destruction of both an Ori battlecruiser and a Wraith Hive-Ship

Suffering massive losses, the Free Jaffa, under Setak, used the Dakara Superweapon to destroy the crew of an Ori battlecruiser. Adria retaliated by destroying the weapon and devastating Dakara, fracturing the Free Jaffa Nation.

Eventually, SG-1 and the System Lord Ba'al discovered the location of where Morgan hid the Sangraal. After discovering Adria in their midst, they were transported to a planet where they learned that Morgan had destroyed the Sangraal, but hidden the real prize: Merlin, held in a stasis pod so that he could one day rebuild the weapon. Merlin agreed to help them, but his body had aged to much while in the pod, and he transferred his memories to Daniel Jackson. Daniel built two phases of the device, but Adria found where they were and captured Daniel and the weapon. Adria believed that she converted Daniel to Origin and made him a Prior of the Ori, but Merlin's conciousness was able to protect him. He made contact with SG-1, and convinced them and Jack O'Neill to shut down the Supergate so that he could send the weapon through. They succeeded, and but the Ori army regained control of the Supergate, sending another six ships into the galaxy.

SG-1 set a trap for Adria, but it was ruined when Ba'al kidnapped her and took her as a host. With the help of the Tok'ra, they removed Ba'al, but he released the symbiote toxin into Adria. Dying, Adria ascended.

When the Asgard realized that they were unable to repair the defects caused by their constant use of cloning, they decided to commit mass suicide and leave their technology and knowledge to the Tau'ri. The new weapons are capable of piercing the shields of the Ori battlecruisers. With this new technology, the Tau'ri are now a potential threat to the Ori Fleet.