The Onyx empire, which started off as a relatively average empire from the southwestern corner of the continent, now ruled the entire continent.
The name of the continent, Onyx Continent, came from the Empire as well. The Onyx Empire made its name around the continent, and at its throne, Emperor Gohlhog was known by the whole world.
The Empress gave birth to a set of twin sons, each of which grew to be formidable princes. Even though they grew at a time of peace after the war, the princes were trained as though the war was around the corner at each moment.
And then, after years, it came time for the Emperor to choose the heir to the throne.
The Emperor tried his best, but he could not choose a single son out of the twin. Both were equally capable and neither was older to have a right over the other.