Mannslieb

The two moons. Guess which one is evil.

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 the End Times completely unharmed. Though, to be fair, after the destruction of the World that Was into space debris, Mannslieb is basically just a big rock floating into space, probably getting pummeled by all the remains of the old world.

Age Of Sigmar

When Dracothion recreated the World-That-Was as the Realm of Azyr, Sigmar built his capital city, Sigmaron, on top of Mannslieb. He built on top of his personal palace spire, Sigmarion, an artificial star he called "Sigendil". It also looks like a massive lamppost from afar, which is hilarious.

Sigmar's personal lamppost is pretty damn easy to notice.