Jax was a demon who was exiled by the previous Source of All Evil. He worked for Kurzon and when the Seer came to "warn" Kurzon about a powerful witch on his trail, Jax intruded saying not to trust her that her loyalties were with the previous Source.
Jax appeared in a total of 1 episode over the course of the series.
- Season 4
- The Three Faces of Phoebe