Gaiaterra: Elysea's Conflict/The Matrix War

The Matrix War, was a major armed conflict that began in 2029 V.C., triggered when SKYNET managed to hack into the Elswords Empires nuclear armament, intending to launch their entire arsenal to wipe out Gaiaterra in nuclear fire, causing Optimus Prime, one of the few AIs who developed compassion to life, to rebel along with countless other AIs. Causing a war across the globe as SKYNET sends its army out among Gaiaterra, forcing the other nations to defend their homeland, allowing SKYNET to get the codes while they were distracted, with only Optimus, the island he allied with, and the Elsword Empire, being the only ones who know SKYNET's true goal and fight to stop him. Ending with the formation of the Guardians Of Gaiaterra.

In Gaiaterra: Elysea's Conflict, It is the DLC Tacitus, and origin, story for the Guardians of Gaiaterra.

Rise Of The Machines
"In time, we realized that SKYNET didn't intend to conquer us with it's hordes of machine, that it was just a distraction while it went for its true goal. But what that goal is we don't know. And the Empire aren't giving any hints..."

-Aquilan General John Connors, retelling the events of the Matrix War

Birth Of The Autobots
"Organic life is transient and strange. Unlike us they wither and weaken with age and act illogically, but that is what makes them beautiful, and worth defending."

Those who know of the island of Atlatea also knows of the Autobots, a group of SKYNET AI who developed a compassion for life and rebelled, led by Optimus Prime and his second in command Bumblebee. But only those who met him and listened to his story weill know the true reason why he joined Atlatea and his origins.

Before he became Optimus Prime he was designated as Orion Pax, one of the few original AI created by the Katsuragi before the accident, and, like many of the original AI, was loyal to SKYNET. During this time he was simply one of SKYNETS generals, uncaring about life like every AI, though he was rather unique with his fascination and desire to examine organic life, despite how transient they were compared to him.

But all of that changed in the year (insert date) V.C. As during one of the the many battles SKYNET waged he, alongside his second in command Bumblebee, were knocked out in an unexpected (insert faction) bombing strike while at sea during a storm. The damages they sustained had forced their body to go into emergency sleep mode, and with the raging sea and the (insert faction), SKYNET thought they were destroyed, not bothering to find their carcass.

Soon, a few years after the war, Both Orion and Bumblebee would wash upon the shores of Atlatea. And, after receiving confirmation that they were not from the Protectorate, were repaired and brought back online by the island's head researchers dr Thomas Light and dr Nora Wakeman. But, due to their previous damage, both of them had amnesia, only knowing their names and their supposed superiority to organics, and soon formed their own enclave, staying away from the "inferior" organic.

During this life on the island Orion soon began examining organic life, wanting to know why he thought they were inferior, leading to his fascination with how transient their life was. As he is basically an immortal machine, the fact that organics often act illogically or without reasons, by something called emotions, fascinated him.

(insert rest of lore here)

The was finally won when Orion managed to get close to the ACU and planted the charge. But he was too injured to escape the blast, and his body was destroyed in the ensuing explosion. But, fortunately, his spark survived, and Thomas and Nora were able to build him a new body. Thus, Orion Pax died defending the lives of what he once thought was beneath him, and was reborn as Optimus Prime, leader of the Autobots.

Defying Judgement, The Final Battle Against SKYNET
"SKYNET must be stopped, no matter the cost."

-Optimus Prime, toward the now formed Guardians, before the final battle of the Matrix War

On the season of Aion 59, 2029 V.C. SKYNET had all of the Empires launch codes and began decrypting them, and within 24 hours he would have access to the Empire's nuclear stockpile and wipe out all of Gaiaterra. The Empire brutally decimated in their vain attempts to stop him, while the other nations were too busy defending themselves to know of SKYNET's true plan, SKYNET, at a glance, had won.

Yet there was still one nation that knew of his true goals and still fights. The nation of Atlatea and the defectors of SKYNET led by Optimus, now christened the Autobots, united as the Guardians of Gaiaterra and planned one of the greatest invasion on Matsushima Island in a last-ditch attempt to stop him. An untold battle that saved millions, yet only known by the Guardians, Empire, and SKYNET, known as Defying Judgement.

Trivia

 * The campaign, if you can't guess it, is based off Judgment day from the Terminator series, with SKYNET wiping out most of humanity with nukes, except in this world he was stopped by Optimus Prime.