Lehon and the Holocron of Darth Revan
"The dark side is strong here. Far stronger than it ever was on Korriban. This is where we will find the power to destroy the Jedi—not in Kaan's Brotherhood!"
After landing on Lehon, Bane began his search for the Temple of the Ancients, and along the way managed to tame a wild rancor to be used as his steed. He felt a much stronger connection to the dark side on Lehon than he did on Korriban, which reinforced his belief that the Brotherhood was flawed. Once he made his way to the temple, Bane began searching for any dark side relics. Though the temple appeared empty, he sensed a great power hidden there, and so continued to search until he located a holocron that had been created by the Sith Lord Darth Revan millennia ago. Thrilled at having his faith rewarded, Bane activated the holocron, and spent several weeks studying it. From the holocron, Bane learned a tremendous deal about the dark side and Sith—more than he had learned in his entire time at the academy, he felt. The knowledge he gained from this holocron validated his view that the Brotherhood needed to be destroyed for the Sith to conquer the Jedi.
Here is a storyline about Bane's journey on Lehon. Full character description can see on Wookieepedia.