The Revan Mythologies:
Jedi holocron gatekeeper Llia Orpin provides an extensive account of Jedi history, including its possible origins on Tython, via series of fables called "the Revan Mythologies." Unfortunately, the myths fail to provide a precise location for Tython and lack corroborating evidence for its existence, making it difficult for scholars to accept her version of history. Most scholars consider the myths derivative of the Qel-Droma Epics, updated to to better acculturate Jedi younglings of the day.
Many of the stories in the Revan Mythologies feature a mysterious alien species, the Rakata, as the antagonist. The reptilian species is said to have dominated the galaxy using exotic machinery and hyperspace-capable ships that employed the Force as a power source. Jedi heroes in the Revan Mythologies often discover Rakatan devices of astonishing power and were forced to choose between destroying the devices and being corrupted by their power.
Originally posted by DarthAnt66
The sourcebook states the Sith shrine beneath the Jedi Temple was the reason why the Jedi's minds in the films were clouded.
That seems to contradict accounts that it's Palpatine's doing, which makes more sense given that it begins to happen in the films.
Any mention of Bane?
"When the Sith built their shrine on Coruscant, they did so over a powerful light side vergence. This decision was made in an attempt to corrupt the vergence and use its power to fuel dark ties. Their plan worked to a point, and by the time the Jedi took Coruscant and pulled the shrine down, the vergence had become corrupted with dark side energies. The Jedi were well aware of the dark side corruption of the vergence, but believed they could reverse the process and return the vergence to the light side. Thus, they built their new temple atop the foundations of the old Sith shrine. Unfortunately, the Jedi were wrong on this account. Even as they built the temple, a small portion of lingering Sith corruption infused its foundations. The hint of dark side influence may have been enough to cloud the judgement of the Jedi, leaving them vulnerable to the manipulations of Darth Sidious."