Just recently I have been watching all the starwars movies in a row, like i do every now and then, and i realised that Darth Sidius really doesn't do anything, he gets Vader to do all of his work for him, Darth Sidius is the worst sith lord ever, he has no good power, as in he hasn't done anything worth remembering exept starting an empire that had been started more than a thousand years previously. Vader at this point is so corrupted that Sidius is like Vaders father. Sidius has more power over vader, is the impression vader is getting, but like the sith always do, the apprentice killed the master.

But vader also killed himself by wanting to see luke with his eyes by taking of the helmet and breathing control he died in the arsm of his beloved son, just like the prffacy suggested vader brang ballance to the force, Two sith against thousands of jedi, he killed all the jedi but two, (obi-Wan) and (yoda) and there were only two Sith lords, so he did bring balance two the force and was saved by his sone from the corrupted dark side.

Leaving only one jedi left, the greatest jedi of all Luke Skywalker, who then started a jedi acadamy on endore, according to the sw.com data banks.