In the heart of the Barrens is a deep, semi-circular canyon the centaur call the the Circle of Dust. The centaur gather on the rim of the Circle to watch the dust devils roll in off the savanna, believing that the earth writes their destinies in the whirling sand. They also believe that the earth can be appeased with offerings, so they throw gold and jewels into the dust devils as they collapse into the canyon. The accumulated offerings have proved nearly irresistible to passing orcs and goblins, although most potential thieves are caught by the centaur, who behead the intruders and post their heads around the rim of the Circle of Dust as a warning. (WRPG 190)