Note: This description is copied from elsewhere on the Internet, where it often appears on campaign setting websites (e.g. 1, 2, 3, 4). I am uncertain of its origin, or I would credit it here.
In remote regions of the world, the last remaining plinths, monoliths, and statues of the great giant empires bow their heads in desolate obscurity. Where once those empires sprawled across all lands, now the giants dwell in isolated tribes and clans.
Giants are almost as old as dragons, which were still young when the giants’ heavy feet first shook the foundations of the world. As they spread across new lands, giants and dragons fought bitter generational wars that nearly brought both sides low. No living giant remembers what started the conflict, but myths and tales of their race’s glorious dawn are still sung in their steadings and holdfasts, vilifying the primeval wyrms. Giants and dragons continue to harbor grudges against one another, and it is seldom that they will meet or occupy the same area without a fight.
The Ordning
Each of the main giant races—the cloud, fire, frost, hill, stone, and storm giants—are related by common elements of history, religion, and culture. They view one another as kindred, keeping any inherent animosity over territory and ambition to a minimum.
Giants belong to a caste structure called the ordning. Based on social class and highly organized, the ordning assigns a social rank to each giant. By understanding its place in the ordning, a giant knows which other giants are inferior or superior to it, since no two giants are equal. Each of the giant races analyzes a different combination of skills or qualities to determine the ordning. Giants make excelling in these qualities the purpose of their lives.
At the highest level of the ordning, the races of the giants are also ranked according to status. Storm giants are the highest in the ordning, followed by cloud giants, fire giants, frost giants, stone giants, hill giants, and finally giant kin such as fomorians, ettins, and ogres. Regardless of a giant’s rank among its own race, the chief of a hill giant tribe is inferior to the most common of stone giants. The lowest ranked giant of any type is superior to the highest ranked giant of an inferior type. It isn’t considered evil to disrespect or even betray a giant of another type, merely rude.
The Titans exist at the very highest level of the Ordning, revered by giants as the pinnacle of form. Unlike giants, titans are immortal, with some believing them to be descended from—or otherwise related to—the gods themselves.