The Yamatian Invasion refers to the time between the years 1000-1003 AE when the Yamatians suddenly attacked their neighbouring countries and conquered them with help from the Clergy of Mardük. The first nation to fall was Libaterra, and soon other nations followed. Invading Aison took the longest time, but the Yamatians eventually succeeded in securing it as well.
However, the Yamatians' victory would be short-lived, because from year 1003 AE onward they would face a new threat that rose from Remon: a growing army of men, elves and dwarves united under the banner of the Grand Alliance. The conflict between the Yamatians and the Grand Alliance would escalate and begin a devastating world-wide conflict which is commonly referred to as the Great War.
- Main article: Unification of Yamato
After a powerful struggle with Emperor Takeshi Ofuchi, Shogun Masamori Hyuga emerged victorious and began a campaign to unite the clans of Yamato under his rule in 1000 AE. He formed alliances with various nobles and even the Clergy of Mardük and the Clergy of Nergal and defeated those who did not surrender peacefully. The unification not only grew the Shogun's army but also made it more cohesive and deadlier. The magical aid of the dark clerics helped him achieve his goals quickly.
They wasted no time setting up the next stage of their grand plan: a world under the yoke of Yamato. To this end they sent various dark clerics to sow the seeds of discord in the neighbouring kingdoms. Remon had the conflict between elves and humans, Libaterra had the civil war, Maar Sul had political machinations, Scundia was generally clueless, and in Aison the clerics backed up an attempted coup against King Byron Kagawest. With this groundwork done, they managed to weaken the nations internally, which would make the invasions much easier.
High Cleric Distreyd Thanadar XII managed to secure a shard of Krystallopyr and leeched its powers to increase his already considerable magic to tremendous levels. He used his magic to cast a plague of nightmares on the entire continent of Libaterra, the nation closest to Yamato, thus weakening its people. The Shogun sent his navy and army to Libaterra immediately, and thanks to Distreyd's magic, they conquered most of the continent relatively quickly.
The Yamatians wasted no time. As soon as they had set up a puppet government and left a sizable force in Libaterra, they moved to Maar Sul, Scundia and Remon next. Their blitzkrieg tactic worked, catching both nations with their pants down. Distreyd's power kept growing at this time, and he began to influence the the once strong Shogun who was mysteriously growing weaker every passing month.
The invaders faced their hardest challenge with Aison. The Aisonians had realized in time what was going on and began to fortify their defenses. However, even that didn't stop the Yamatians. They used a clever tactic to fool Aisonians into thinking that they were attacking their coastal towns. While Aisonians were occupied at the coast, most of the Yamatian fleet boldly sailed to Myridia, the very capital of Aison, using the main river. The Yamatians put themselves in great danger but thanks to their dark allies they pulled it off and reached the unsuspecting capital in mere days.
Thus began the First Battle of Myridia as Yamatian forces led by Admiral Yasuo Fukuda and cleric Zarnagon attacked the city. Despite the Aisonians' heroic struggle, the magic and brute force of Yamato and the Clergy of Mardük was too much, and so King Byron Kagawest and his followers had to flee from the city which the Yamatians quickly took over.
In the following months Yamato secured a foothold in Aison, quickly taking over most of its major cities. Only the Magestar and Tel'Elee seemed impenetrable but that didn't matter to Distreyd XII that much: he now effectively controlled most of the known world.
- Main article: Great War
Drunk with power, the dark clerics of Mardük betrayed the clerics of Nergal, with whom they had had an uneasy alliance from the beginning, thus driving the rival clerics to side with the rebels. When the Shogun fell ill, Distreyd XII became the de facto leader of both Yamato and the Clergy of Mardük, which angered the Yamatian officers. Power struggles began and took place in the shadows as dark clerics and Yamatians tried to gain more power and discredit each other. This division would have grave consequences in the future but they were too short-sighted to realize it.
Although Yamato had taken over the world, it hadn't managed to squash various rebel factions that bided their time. The rebels couldn't overthrow the Yamatian conquerors because the Yamatians had sheer numbers and magic on their side. The rebels also couldn't agree on tactics and thus remained divided. It took the arrival of Marcus Sarillius to tip the scale: he formed the Grand Alliance in Remon and began to unite various factions under one banner to drive the Yamatians out. Thus began the Great War.