Sith Inquisitor

"The Sith Inquisitor is a master of the dark side of the Force. Inquisitors overwhelm their targets with Force Lightning and lightsabers alike.

Primary Attribute: Willpower. Willpower increases the damage and critical chances of the Inquisitor’s Melee and Force powers. This remains so for the Assassin, while the Sorcerer’s Willpower increases Force damage and healing powers instead.

Advanced Classes (Available at level 10): Sith Sorcerer and Sith Assassin

Sith Sorcerer (Damage, Healing): Sorcerers unleash Force Lightning from a distance, disintegrating their targets with powers like Lightning Strike and Crushing Darkness. Sorcerers skilled in Corruption can twist dark side energies to unnaturally prolong their lives and the lives of their allies.

Sith Assassin (Damage, Defense): Assassins are deceptive and manipulative Force wielders. Trained with stealth and double-bladed lightsabers, an Assassin can sneak in close to finish targets with acrobatic lightsaber moves and deadly lightning attacks. Assassins embracing Darkness can shroud themselves in dark side powers that obscure sight and leverage the defensive capabilities of a double-bladed lightsaber to harden their defenses."
 * ―In-game Codex

The Sith Inquisitor is one of the two Empire-aligned Force-user classes, standing opposite to the Sith Warrior.

A well-known Inquisitor is the Sith Lord Vindican.