Force stealth

"You're the Sith Lord!"

- Anakin Skywalker realizes Supreme Chancellor Palpatine's dark nature

Force stealth or Force Concealment was a power that was used by highly skilled Force-sensitives to mask their Force alignment (Light or Dark), their ability to use the Force, or even their entire presence from other Force sensitives.

Effects
This ability manifested in different forms; Vergere would shrink her presence in the Force to a microscopic size, where she was almost undetectable and able to avoid mental attacks, even from Luke Skywalker. Palpatine was the most powerful and notorious user of this power, having hid his dark nature for over three decades from the Jedi Council, even when in the same room. It has been argued that Revan may have used the technique to shield his true light-side affiliation on Korriban in order to infiltrate the Sith Academy. Darth Traya used a powerful version of this to evade both the surviving Jedi and her Sith apprentices, as well as mask her nature from her own student, the Jedi Exile who in turn may have mastered this ability. Millennia later, Granta Omega used this power to disguise his dark-side nature from Anakin Skywalker and Obi-Wan Kenobi. It is unknown exactly which derivative of Force Concealment Omega employed. Other users included the Jensaarai, who constantly hid their presence in the Force from both the Sith under Darth Vader and the New Jedi Order. The spirit of Exar Kun most likely used this power to escape detection by Luke Skywalker when he founded his Jedi Praxeum on Yavin 4, as he was only discovered and destroyed upon revealing himself to the trainees at the academy.

Jedi Masters Obi-Wan Kenobi and Yoda both used a form of Force concealment to shield themselves from Palpatine and Vader in their exile.

It is also speculated that this is the power used by Darth Bane to escape Kaan's thought bomb.

Darth Zannah also employed this technique while assuming the identity of a Jedi in order to gain access to the Jedi Temple.

Luke's control of this Force ability was so precise he was able to allow certain individuals including his own son to sense his presence when hiding from adversaries. Darth Caedus used the power so much that he constantly remained hidden with little effort and taught the power to his apprentice Tahiri Veila.

The Hidden Ones of the Baran Do sages used this power to fake their own deaths during their farewell ceremony.

Behind the scenes
In the Wizards of the Coast Star Wars Roleplaying Game, this ability is referred to as "Force Stealth". The original version allowed a Force-user to not only hide his or her Force sensitivity, but increase his or her ability to hide. The Revised version only provides a way to cloak one's connection to the Force. Any use of the Force causes this ability to fail, although Jedi Sentinels can learn to use Force Stealth and Force Camouflage together.

Appearances

 * Star Wars: Knights of the Old Republic
 * Star Wars: Knights of the Old Republic II: The Sith Lords
 * Star Wars Episode I: The Phantom Menace
 * Rogue Planet
 * Star Wars Episode II: Attack of the Clones
 * The Cestus Deception
 * Labyrinth of Evil
 * Rule of Two
 * Star Wars Episode III: Revenge of the Sith
 * Star Wars Episode VI: Return of the Jedi
 * I, Jedi
 * Bloodlines
 * Tempest
 * Exile
 * Sacrifice
 * Inferno
 * Fury
 * Revelation
 * Invincible
 * Outcast