War of the Cloud

Overview
The War of the Cloud was the last war which the Mages aided in, and additionally the last war of the Immortal Reign. It saw more than half the population killed, injured, or misplaced, and wiped out the last of the Mages.

It lasted for around 6 1/2 years, although the fighting only became heavy after five years. It ended with Luna's sacrifice to protect Theo, which led to them reuniting with One and the rest of the Mages in Asphodel.

Causes
The War was primarily caused by the Mist, but was heavily affected by Theo's grief around losing Galaxy. This caused him to be easily corrupted by the Mist and break away from the Palace, kidnapping and taking Jac with him. He set up a base outside Regathia.

Years 1-5
With Theo gone and Jac held hostage, the Mages tried to figure out their next move. The Mist had taken over Theo, using his anger and sadness to get inside him and weaponize him to take down the Mages.

Harmony and Luna had many bitter arguments as to what should be done next, as even Luna was still mouning the loss of her daughter. They finally realize they can get nowhere as they learn that the base in Regathia is amassing an army to attack Shade and the palace.

One of the soldiers is captures and Electra figures out a way to switch the places of the enemy prisoner and Jac, but something goes wrong and Luna takes Jac's place.

With Luna captive in Theo's base, Sola has to step up and take charge of the throne, which is disastrous.

Luna tries to restore Theo to his senses, but nothing can get through to him, save for a rare few moments of clarity.

Years 5-6 1/2
The Mages stormed the base, rescuing Luna and taking Theo back with them to the palace. The Mist grows more powerful, and Theo falls into a coma.

Residents of the Cloud turn against each other, and battles break out across the regions. Mist attacks become more common and slowly the Mages are picked off until only Luna and Theo remain.

The end
The conclusion of the war was brought about after Luna sacrificed herself for Theo, so that both of them perished. They ended up in Asphodel, with all the other Mages... except for one.

Lexi was th lone mage that survived, completely under the radar and hidden away. After it ended, she worked to rebuild the Cloud and then seemingly vanished again.