Mus was the only moon of Mercury, a tiny gray rock rendered invisible to Earth-based observers by powerful magick. It served as the home of the Hermetic Fors Collegis Mercuris, and hosted a large number of Batini refugees after the City of Brass Chantry on Mercury's surface was destroyed. [1]
In 1995 the moon was conquered by the Nephandi, and in 1996 it appeared to crash into Mercury's surface.[2] In one of the Time of Judgement scenarios for Mage, however, the Unnamed has occupied Mus and uses it as his base of operations. [3]