Darth Revan V.S Darth Bane and Darth Rivan.
The battle take place in the unknowed region. Start Random for Bane and Revan. Rivan start at CUlarin.
Darth Revan Succefully destroyed Tru sith empire before ToR Era and is retreated to Lehon where he written many book about the force the Dark side and still record things in his Holocron.
Rivan and Bane know Lehon location and have read Rivan Holocron.
Who's Rivan?
http://villains.wikia.com/wiki/Darth_Rivan
http://starwars.wikia.com/wiki/Darth_Rivan%27s_holocron
http://www.starwars-holonet.com/encyclopedie/personnage-dark-rivan.html
Darth Rivan Knowledge greatly help plagueis. He read revan Holocron....
Darkness is his ally he know the Rule of two and hide in the Dark little is know about him...
He have created a plant that can convert méthan into oxygène on masscale. He use it to create a secret base in an hostile world name Almas.
He used sith alchemmy to create a link between his commandement and his troops.. The nature of those remain unknowed.
He failed to terraform Almas.. You see why I hate Jedi? they are non ecologist !!!
He also created aforteress immune to blaster technology.
Cut of supply the guy feed on the force during on years before dying...
Some archeologues of the Jedi order eventually found his work. He was an amazing scientist.
But Almas atmosphere still quite.. explosive.. Since it is now made of 100% of Oxygène. No Azote... + His creation have evolve into some kind of carnivore plant that is kinda agressive...