Ideally, the magus becomes a nexus between God and the World.Nexus is of Latin origin, meaning a “binding together” of two things. The word connotes a link or connection “with a motive for mutual benefit,” as in a network. The word can also refer to a central point or core.
—Christopher I. Lehrich, The Language of Demons and Angels (2003)
Nexus was the favorite magic word of Nicolas of Cusa, the 15th century philosopher, mathematician, and cardinal.
A nexus may refer to a dimensional gate or portal. For example, in the fantasy novel Beyond World’s End by Mercedes Lackey, a nexus is “the rent in the fabric of Reality that let[s] the power from the World Beyond seep over into this one.”
 Steve Blamires, Magic of the Celtic Otherworld (2005)
 P.J. Alexander, Policing India in the New Millennium (2002)
 Anita Albus and Michael Robertson, The Art of Arts (2001)
 Mercedes Lackey, Beyond World’s End (2001)