Mannslieb
The primary (and natural) moon of Warhammer Fantasy. It's name is a reference to the human god of the seas, Manann due to the effect it has on tides. It's presumably a fairly normal sphere of rock and regolith. It is associated with many different gods, primarily among them being the High Elf god Lileath. When it's unnatural twin, Morrslieb eclipses it, you're in for one wild night. More specifically Geheimnisnacht and Hexensnacht, Halloween and New Years Eve respectfully.
End Times
Mannslieb miraculously survived End Times completely unharmed.
Age Of Sigmar
Sigmar built a giant lampost beneath it to illuminate the new home of humanity, Azyr/Sigmar/Whateverheim.