Ludo Kressh's armband
The armband of Ludo Kressh is an artifact that the Sith Lord Ludo Kressh sported throughout the Great Hyperspace War. This dark side artifact, when equipped, had the capacity to augment the user's inherent physical strength, while also providing a degree of defensive capability. It is thought that the Jedi Exile discovered the armband while exploring the Tomb of Ludo Kressh.
Behind the scenes
Within the game itself, equipping the armband is restricted to characters whose alignment is inclined towards the dark side.