Cysta

Cysta is one of the two moons of Valdennia. It is only referred to once in the series, in Rally Cry, when Keane briefly glimpses it through passing clouds. Here, it is referred to as the 'second moon', but they are also called the 'twin moons' from time to time. It appears that both moons are much smaller than Earth's Moon, and share some kind of similarity in their orbits around Valdennia.