Nyssa, located in the Mecetti Province, was a planet found within the Nyssa system of the Tapani sector's. Millennia before the Battle of Yavin, this world saw the emergence of the Mecrosa Order, a Sith cult of assassins supported by House Mecetti.
The Order evolved into a Sith assassin cult during the Great Sith War, generating several Sith Lords who fought for Exar Kun.
During the Cleansing of the Nine Houses, a part of the Old Sith Wars, the Jedi and House Pelagia eradicated the Mecrosa Order. Later, during the time of the New Order, the younger members of House Mecetti secretly brought the Order back to life.
- Player's Guide to Tapani
- Lords of the Expanse
- Evil Never Dies: The Sith Dynasties on Hyperspace (article) (content now obsolete; backup link)
- Jedi vs. Sith: The Essential Guide to the Force
- Knights of the Old Republic Campaign Guide