Shadow Sites

Shadow Sites are one of many names for certain places, typically (but not exclusively) found underground on planets and moons with solid ground. These places have strange effects on the minds of psy-users that cannot be scientificly explained yet, and are also known to have certain effects on non-psy users. Many of these sites have been located by the Jedi Order, and they regard these as dangerous, and prohibit access to them. Weird Crystals  are known to form in these locations, and these crystals are the same that are used for Lightsaber. All jedi temples are infact located near, or directly upon these sites, but many sites only remain under jedi protection.