A nexus is a physical manifestation of all five of the elemental Ka fields. They are extremely rare, but can be predicted through the study of Astrology. Occasionally, multi element creatures can be born, though they rarely can exist after the nexus dissipates. On even rarer occasions, a new Nephilim can be born. If the Nephilim is capable of incarnating in a Simulacrum, it can live on after the nexus ends.