Banshee

A banshee is the force spirit of a strongwilled, darkside individual usually female humanoid, a soul and essence of a deceased Force-user who denied the will of the Force upon death. Because of its rage at the loss of its own life, it delights in bringing death to any living creature it encounters. This creature appears as a translucent image of the form it held in life. With the passage of time, the banshee’s image tends to become blurred and indistinct, though the creature remains recognizable as a humanoid. It usually comes in a female form. Banshees hate all living things with dark side fury, and they readily attack anyone foolish enough to trespasses within their territories. A banshee typically uses its horrific appearance to drive off less powerful foes, then employs its howling wail one or more times to damage any who remain. Finally, it finishes off the intruders with its Charisma drain in melee. If overmatched, the creature flees into the earth. Banshee screams does not negatively affect other banshee.

Horrific Appearance: Any living creature within 10 squares that views a banshee must make a successful Fortitude save (DC 18 Intimidate) or permanently gains -8 to all saves and -2 to movement. A creature that successfully saves against this effect cannot be affected by the same banshee’s horrific appearance for 24 hours. This does not use a turn, but it is automatically activated at the beginning of every combat cycle withing line of sight. Negative effect can be removed only with Force Heal, which must beat the very same DC of 18, if it fails, Healer can try again after 24h.

Detect Living: This ability functions like the force sense, except that it detects only living creatures and the range is one-half mile. Banshee detects living automatically without any roll. This ability cannot be used to foresee future or events. The banshee can use detect living up to three times per day and spends it as an active turn or a counter. This cannot detect droids.

Incorporeal Subtype: A banshee can be harmed only by other incorporeal creatures, or energy weapons, energy force powers, and supernatural abilities. A banshee can pass through solid objects, but not force effects, at will. Its attacks ignore natural armor, armor, and shields. A banshee always moves silently and cannot be heard with awareness checks if it doesn’t wish to be. A banshee is immune to mind-affecting effects, poison, sleep, paralysis, stunning, disease, death effects, and any effect that requires a Fortitude save unless it also works on objects. It is not subject to critical hits, subdual damage, ability damage, ability drain, energy drain, or death from massive damage or sneak attack. The creature has darkvision (20 squares).

Force Scream (Banshee):
The Force scream had been called “a wave of hatred, amplified and fueled by the dark side, that is capable of smashing through mental and physical defenses with ease.” A number of references to Dark Jedi in Old Republic archives often mentioned the Dark Jedi violently losing control in the final moments of battle.
  "That scream…what is it? It sounds like…a man being eaten alive!"
  ―Nomi Sunrider, hearing Exar Kun's anguish through the Force.
Force Scream