Teriasa (pronounced teh-ree-AH-sah) is an aerolith, one of the few believed to still be aloft, though there have been no reliable reports of its sighting in at least the last two hundred years. Prior to this it regularly journeyed across the world, carrying its elven inhabitants between places as far apart as Brightmarch, the Oasis, and the highest peaks of the Spine. For a time in the late eighth and early ninth millenniums Teriasa was remarkably amenable to contact with outsiders, a rarity for the aeroliths. During much of this period it remained over Brightmarch, near the modern settlement of Katekor, where its portals to the Plane of Water were opened and allowed to flow off the edge of the flying city into a waterfall several hundred feed tall.