The Mohssian Empire was a historic empire that formed from the ancient Armans and their allies. They controlled most of Northeastern Eloa for about two millennia, slightly longer than the Valgan Empire.
When the brutal Lyzakks crossed the ocean from Exoltha and invaded Eloa, it seemed for a time that nothing would stand in their way as the conquered the entire continent. However, the formerly peaceful Armans heard well in advance about the impending invasion of their territory in modern-day Sair, and rather than fleeing or preparing to surrender, they instead decided to booby-trap the countryside. Most notably, they created huge dams to leave large areas seemingly safe and dry, then broke them when Lyzakk troops tried to cross or make camp in the flood plains or riverbeds.
After several failed assaults on the Armans, the Lyzakks decided to try to go around them but by that time every neighboring country had formed alliances with the Armans and the Lyzakks found that they were stymied at every turn. Eventually, they gave up on trying to press further and consolidated the lands that they had already taken in Eloa into the Valgan Empire in the East. At the same time, the Armans began annexing their former allies outright to form what came to be known as the Mohssian Empire in the West.
The Mohssian Empire always had a strong enough military to hold against outside threats. Instead, it fell to a series of internal rebellions starting with the Redwater Uprising. Though the initial Uprising was quickly put to an end on the Day of Clear Sky, its early victories inspired a number of other discontented groups to rise up and confront the Empire. Though any single one of them would not have been able to stand against the Empire's military, they were collectively able to split the enemy forces with the knowledge that they could not be left unchecked, allowing defeat in detail.
The Mohssian Language was the primary language spoken in the Empire, and it remained the standard for its constituent states following the collapse to a far greater degree than the Valgan Language did.