This is my top 10 most powerful Sith Lords.
Music: Doom E1M8 – Sign of Evil
Source of information: Wookieepedia, the Star Wars Wiki (www.starwars.wikia.com)
Know that this is my personal view. Disagreement is expected.
Note: All characters ARE Sith Lords. No Dark Jedi, Sith Acolyte or Cyborg (Grievous) in it.
There’s a revision of the list (mostly, just slight rearrangement of the order with Adas replacing Darth Nihilus):
9 FREEDON NADD
8 DARTH ANDEDDU
7 DARTH SION
6 NAGA SADOW
5 DARTH PLAGUEIS
4 DARTH SIDIOUS
3 ADAS – the legendary Sith king who united the Sith of Korriban earned the title of the Sith’ari or the Overlord of all the Sith and finally drove away the Rakatan invaders to protect his home planet and giving his life in the process ( he PERSONALLY led his forces into many battles)
2 MARKA RAGNOS
1 DARTH BANE