Force nexus

Force nexus is a term used to refer to any location where the Force, or any particular aspect of the Force, was unusally strong. Such nexuses could be caused by any number of different events. Korriban in general and the Valley of the Dark Lords specifically were nexuses of the dark side due to the long-term presence of the Sith Lords, Nam Chorios was a nexus of the Force due to the omnipresence of the Tsils, a form of life, Vjun was a nexus of the Dark Side due to the horrible events of its past, the Dark Side Cave on Dagobah and a spot in orbit over Endor were tainted by the death of Dark Side users, Byss was a nexus of the dark side of the Force because it housed Palpatine's clones and his various Sith Alchemy experiments and the dark force energies sucking the lives on the planet.

Palpatine himself was constantly surrounded by a Force nexus due to his power in the dark side.

The natural mountain on which the foundation of the Jedi Temple on Coruscant rested was a nexus for unknown reasons, but is was likely because of all the Jedi that had lived there for hundreds of years. The most powerful nexus was the Valley of the Jedi, where the spirits of several thousand Jedi, both light and dark, were trapped after the Seventh Battle of Ruusan, a perhaps limitless source of Force energy even after the spirits were freed. It was likely that many dark side nexus locations were in truth "wounds in the Force".

Behind the scenes
"Force Nexus" is a term used primarily by authors in the narrative voice, as opposed to character dialogue (where it is used rarely if at all), making it unclear if it is a term from the Star Wars universe being appropriated by authors or a real-world term sneaking into the Star Wars universe. Furthermore, it has never been defined either as an in-universe or out-of-universe term, and the definition is simply derived from its usage.

Appearances

 * Star Wars Galaxies: An Empire Divided
 * Star Wars Episode V: The Empire Strikes Back
 * Jedi Knight: Dark Forces II
 * Jedi Knight II: Jedi Outcast
 * Jedi Knight: Jedi Academy
 * Specter of the Past
 * Enemy Lines II: Rebel Stand