Europa

""The Infested are spreading throughout the Orokin derelicts in this region.""

There is no boss on this system.

Trivia

 * Europa was overrun by Fusion MOAs during Fusion Moa Event.
 * Europa is one of Jupiter's moons, and may have been chosen due to its possibility of harboring life.
 * Europa is the only celestial body that is not a planet nor dwarf planet that is selectible from the main Warframe screen.
 * The names of the missions are all of demons, hell's rulers and fallen angels.
 * Although being stated in the description that "the Infested are spreading throughout the Orokin derelicts in this region", the planet is mainly occupied by Corpus instead.