Cliff-Marble was a building material taken from the Cliff-Quarries of the Edgelands which was used to decorate buildings in the early days of Sanctaphrax. It was prized for its texture and its luminous glow. The Academy of Wind, intent upon outdoing the other schools, managed to secure a monopoly on Cliff-Marble by organizing what was to become the first of the Leagues of Undertown. It then proceeded to cover the entire surface of its institution with Cliff-Marble, transforming it into the most glamorous facility in Sanctaphrax.