Darth Marr
Accolades:-
Marr is a master of the dark side.
Warlord and master of the dark side, Darth Marr is the most senior member of the Dark Council.
Taken from (Star Wars: The Old Republic: Encyclopedia)
Marr is an intimidating and fearsome individual.
When Marr speaks, he commands the attention of the entire Dark Council with intimidating authority and stern wisdom.
Taken from (SWTOR: Encyclopedia)
Marr is among the most powerful Sith Lords in the galaxy:
In the Emperor's absence, the galaxy's most domineering, powerful, brilliant, and cunning Sith Lead the Empire's path to glory.
Taken from (SWTOR: Encyclopedia)
Marr's battle prowess:-
Marr have single-handedly routed entire armies of the Republic in battles and have exceptional defensive abilities:
Tales spread through the Republic of the masked Dark Council member who routed whole armies and deflected assaults more thoroughly than any planetary shield.
Taken from (SWTOR: Encyclopedia)
Marr soundly defeated a powerful Sith Lord (Darth Lachris*) in a confrontation in which he tested her abilities. Details in the SWTOR article The Price of Power.
Speed:-
Marr is immensely fast. He can move so fast that another even a fully trained Sith Lord can find it virtually impossible to detect him in motion.
Marr approached her with slow, deliberate steps, hands resting on the small of his back. Her master never rushed, always maintained an appearance of control. "I sense a similar hunger for power in you. Do not bother denying it."
"I see no reason to."
In an instant, he was gone. Her nostrils flared slightly as she tried to sense his presence.
"You believe you have earned that power, but you are mistaken," his voice thundered behind her.
She did not flinch. Lachris had been Darth Marr's apprentice long enough to know when he was testing her. He pulled out his holocom to display the Nevoota system and zoomed in to focus on a single planet.
Taken from (SWTOR: The Price of Power)
Marr's advantages in combat:-
1. Augmented lightsaber
2. Customized battle armor
3. No fear of death
Taken from (SWTOR: Encyclopedia)
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*About Darth Lachris:-
A powerful Sith Lord with a despotic temperament, Darth Lachris has never failed in war. Her successes in the Empire's battles have brought her to Balmorra, where she faces the challenge of putting down a resistance that has remained one step ahead of the military since the fight for the planet began.
Darth Lachris is sharp and wary, expecting a scheme behind every action her enemies take. Trained by Dark Council member Darth Marr, she is a warrior at heart with an embittered understanding of political necessity – and a lust for all the galaxy’s bloody pleasures.
Taken from (SWTOR: Codex Entry for Darth Lachris)