Obi-Wan Kenobi wearing a Sith torture mask
The Sith torture mask refers to a type of head covering utilized by the Sith during the interrogation of prisoners, most frequently Jedi Knights. This mask, which appeared quite normal and concealed the entirety of the head with the exception of the eyes, would be forcibly placed on the prisoner. This design allowed the captive to maintain visual awareness of their surroundings. Although appearing as a standard mask, it was actually saturated with dark side power, which served to inhibit Jedi from accessing the Force by disrupting their capacity to focus.
Asajj Ventress possessed a Sith torture mask within Castle Ventress located on Rattatak, and she employed it on Obi-Wan Kenobi in the aftermath of the Battle of Jabiim.