The Green Tide

Background
The biggest blow to the Khanate during the Great Divide was losing their most numerous faction, the Orcs.

Orcs were divided into small warbands of 200 in order to keep them in control. After the War of the Hills was lost, an Orcish leader named Mor'Tok convinced his men to seek out other warbands and unite them as an Orcish horde once again. The Orcish horde was beaten into submission one century earlier by the Khanate, and Mor'Tok saw this as an opportunity to bring it back to it's former glory.

The Horde migrated northwest into the borders of the mountainous region of the Domarion kingdom and continually ravaged the countryside. The roaming horde never directly confronted the massive army of the kindom initially. With the Dwarves still recovering from the last war, they could not send help.

The Collapse of a Kingdom
The Kingdom had to continually force to give up portions of land due to not having enough manpower to hold off such a broad strike at their kingdom. Fertile farms of the north were soon abandoned, and the Orcish horde finally had enough resources to take on the Humans in battle.

The Elves defended their borders, but never went on the attack. Orcs rarely went into their lands and any aid to the Humans would be seen as an aggressive act towards the Orcs. The Kingdom and it's capital were seized by the Orcs 15 years ago, a huge fleet of both military and trade ships helped save the vast majority of people in the kingdom. Two pockets of the kingdom remain. Once is a great port city west of the Confederacy, and the other is a fortified pocket of settlements alongside a forest built during the Khanate invasion era.