The War of the Final Transition, also known as the First Intergalactic War, was a major galactic-scale war lasting from 1,285 BCE to 210 CE. At first, it involved only nations forming an alliance called The Local Axis fighting against a nation known as the Yohjan Confederacy. As time went on, the war came to involve every nation in the galaxy as the Triumvirate Civilization began its campaign of reconquest. In a total war involving well over 1 octillion total personnel (about 41% of total individuals alive in the galaxy), every country threw their entire economic, industrial, and scientific capabilities behind the war effort, becoming organizations entirely built around fighting the conflict. It saw usage of weapons unseen before in the galaxy, including the first utilization of Hardlight blades and Magi as soldiers. Over 500 septillion individuals died in the conflict, making it the single deadliest war fought between Via Sagittarian powers. At the end of the war, the Yohjan Confederacy was meant to be occupied, however, the attack by the Triumvirate made that impossible. When all fighting ceased, every major power was so badly damaged that most collapsed in what was known as the Split of the Yohjan Confederacy.
The War of the Final Transition is generally believed to have started on the 6th of September, 1,285 BCE when the Yohjan Confederacy, under Hal Drusus, attacked The Empyrean. The Empyrean's allies, Dotskgard and The Lowuks Entente subsequently declared war. In a large number of theaters across the galaxy, the Yohjan Confederacy fought the three other great powers in the galaxy. As the war went on, all sides took more and more desperate measures to gain territory. The war quickly devolved into a war of attrition in which gains or losses in territory.
The war would not change until 763
The war has several of what are known as "endings." The first ending occurred when the Yohjan Confederacy collapsed due to internal strife in 0 CE. Immediately afterwards, the largest fragment of the YoC, Erstes Konsortium, started an offensive against the Triumvirate. The next ending came when The Diunity, a large nation mostly uninvolved, stopped giving foreign aid to other nations in the galaxy, causing their assault to stagnate.
The war is one of the main causes of the Split of the Yohjan Confederacy as well as general stagnation in the galaxy. The enemies of the YoC were badly damaged during the war. They had to focus their resources on reconstruction rather than expansion. The War of the Decamillennial Transition was a loss for all that participated.