There is but a single absolute requirement for holding a high seat on the Grand Council of Absalom—one must simply posses one of twelve magical cornucopias and present it at a secret gathering held once a year. These horns are said to have been crafted at the time of the city's founding, some say by Aroden's own hand and from the Starstone itself, though little is actually known of the horns' origins. The cornucopias are closely guarded by their possessors, and should one ever change hands the high seat would change as well, even if the horn were to be obtained through illicit or dishonest means.
In addition to securing seats on the High Council, the cornucopias are also capable of the creation of enough food, water and necessary supplies to withstand any siege. While the official reason for the failure of every attempted siege on the City at the Center of the World has always been the sheer number of clerics within the metropolis who can magically create, transport or summon food and water for the people of Absalom, the cornucopias have always played a major, if secret, role in the city's survival in times of need. This magical property only functions when maritime and overland supply routes into Absalom are blocked by invading forces, the horns ceasing to provide for the city once a siege has been broken.