Klasse Ephemora, alternatively known as Mobus, was a celestial body situated inside the boundaries of the Unknown Regions' Chiss Ascendancy.
Within the existing Star Wars canon, Klasse Ephemora was shown on a map from the publishing house Del Rey. This map was a pre-order incentive for the 2021 book Thrawn Ascendancy: Lesser Evil, which concluded Timothy Zahn's Star Wars: The Ascendancy Trilogy.
Within the Star Wars Legends timeline, the planet Mobus, classified as a gas giant, was initially referenced in The New Jedi Order: Force Heretic II: Refugee. This novel, published on May 5, 2003, initiated the Force Heretic trilogy within the Star Wars: The New Jedi Order series, authored by Sean Williams and Shane Dix. The gas giant made its debut in The New Jedi Order: Force Heretic III: Reunion, the trilogy's concluding book, released on July 3, 2003.