__________________ "Happiness is a lie. Life is horror. The light is always dying all across the universe. The last star will flicker out someday, when it does, all that remains is shadow. And I will be its king!"'-Amahl Farouk
Most sources give the label to Bane, but Sidious might fit the bill better. He is the most powerful sith lord in history, and the first/only to ever "defeat" the Jedi, after all. Or maybe the sith'ari doesn't exist.
It can't be Sidious, because he didn't destroy the sith and remake the sith stronger- he was the last sith, and he didn't destroy the sith. The Sith'ari was more than just a statement of the most powerful sith, after all.
Registered: Jul 2014
Location: Off learning Ground Realities
Eh. He destroyed the Sith by stopping the rule of two, he never intended to be replaced. One could suggest he made them stronger by becoming the immortal, all powerful being that was destined in the prophecy.