Haunting Appearance( Ghostwalk, p. 35)
You can make your ghost body assume a terrifying appearance that can frighten observers.
As a standard action, you can momentarily warp your appearance to such a horrible extent that one creature within 30 feet that can see you must succeed on a Will saving throw (DC 10 + 1/2 your HD + your Cha modifier) or be affected as by a cause fear spell. A creature that succeeds on the save cannot be affected by your haunting appearance for one day. This is a necromantic, mind-affecting, fear ability. Each time you use this ability, you deal 2 points of Charisma damage to yourself.
A ghost without this feat appears as she did at the moment of her death, with wounds and other trauma visible on her ghost body. This affects creatures that see the ghost, as described in the Faces of Death sidebar (earlier in this chapter).