Top 10 most insane ancient sith feats.
Can come from the encyclopedia, some RPG like dawn of delivrance.
Any sith that have received the teaching and adopted the philosophy of the Ancient are ancient sith too.
Past Bane time I consider too many ancient sith knowledge losted to consider any later sith an ancient sith.
The subject must be in controlled of teh Dark side and not devoured by the Dark Side, someone who embrasse the Dark side like at his first taste, not someone who accidentaly deal with the devil to be consumed like Agen Kolar did....
Actually I know that Tulakhord TK = 1,813,030,570,000,000 joules It is close to Revan and starkiller level.. But again ancient sith never show their most powerfull tricks (like Kun who juste O.S a master Jedi...)
I know that Kyp durron go in the peta ton... Or 6x10^26 J....
Again it could be isth sorcery...