Scourge was a pureblood Sith male who served as a Sith Lord of the reconstituted Sith Empire and later as the Emperor's Wrath, the personal enforcer of the Sith Emperor, before he allied with the Jedi Knight known as the Hero of Tython in order to prevent the Emperor from extinguishing all life in the galaxy. Born several decades before the Jedi Civil War between the Galactic Republic and the Sith Empire under the Sith Lord Darth Revan, Scourge excelled during his time as a student at the Sith Academy on the Imperial capital of Dromund Kaas. After two years of service in the outer reaches of the Empire, Scourge was recalled to Dromund Kaas to uncover the person responsible for the recent string of assassination attempts against Darth Nyriss of the Empire's ruling Dark Council.
An expert swordsman, Scourge was exceptionally powerful in the Force, and the Jedi Master Revan believed that he had incredible potential.
As a Sith Lord, he wielded a blood-red lightsaber with a spiked crossguard and fang-like hilt, and he was proficient in at least three forms of lightsaber combat: the defensive Soresu form, the overwhelmingly offensive Juyo form, and the acrobatic Ataru form. In battle, Scourge made use of both powerful, two-handed strikes and strong, sweeping blows with his lightsaber, and he also utilized unarmed combat in conjunction with his lightsaber. Scourge often enveloped his fist with lightning during combat and delivered punches to his opponents. His skill with the blade, regardless of whether he wielded it with his dominant right hand or his left hand, was such that even his instructors at the Sith Academy had been reluctant to battle him while he was still an apprentice.
Scourge's primary gift was the ability to draw strength from the emotions of his opponents, gorging himself on their fear and anger to bolster the strength of the dark side within himself. While his ability initially put him at a disadvantage when facing non-living opponents, as he weakened himself by trying to draw on nonexistent emotions, he learned to overcome his weakness and became just as proficient in fighting droids as any other Sith.