Luaris
From The Saylua Wiki
Luaris is Saylua's "moon", which is only visible from Luaria, the dark side of Saylua. Although Luaris is technically another planet rather than a moon, it is close enough to Saylua to be readily visible from the sky and shines with a bright white color. Thus, humans colloquially call Luaris the Moon of Saylua, after the moon on Earth which was visible during the night.
