Gravis joined the Red-White Kingdom as a general, and he followed every order of the king.
After a while, the king even trusted Gravis enough that he wanted to learn combat from him, and Gravis complied, teaching the king as much about combat as he knew.
The king's power soared, and in the next couple of years, he unified all the other Kingdoms. He didn't do it via war but by inspiring them to follow him. His power was unequaled, except for Gravis, and all the Kingdoms knew of the personality of the Red-White King.
In the end, the land was unified, and the Red-White Kingdom transformed into the Red-White Empire.
After that, the Red-White Empire tried to search for a way to get past the deadly wilderness surrounding their Empire.
Sadly, before they could make any headway, the marauders invaded their land.
The Red-White Empire confronted the marauders.