I hate that thing.
~ Jaina Solo, on ysalamiri

Ysalamiri are Force-resistant creatures in the Star Wars universe. While not overtly antagonistic, the ysalamiri are 


used by several villains throughout the saga. Due to their natural ability to deflect the Force (an instinct which evolved as a defense against their natural predators, the Force-sensitive vornskrs), they are the perfect defense for anyone choosing to oppose the Jedi Order. The Sith are among the few villains who despise the ysalamiri. As Force-

sensitives, they loath anything that robs them of their power. The ysalamiri are typically reserved for mundane foes.

Among the villains who have exploited the ysalamiri's usefulness are Thrawn, Gilad Pellaeon, Talon Karrde, and the Yuuzhan Vong.

Ysalamiri for Force Users

However, these are not the only purposes of the ysalamiri. Often, Force wielders use ysalamiri in order to hide their presence from Force-sensitive adversaries. In the novels New Rebellion and Legacy of the Force: Fury, the ysalamiri became the undoing of certain villains. In the former, they led to the death of Dark Jedi Kueller, after Han Solo and Mara Jade recovered them in order to give Luke Skywalker an advantage over his fallen Padawan. In the latter, the Solo family used the ysalamiri to undermine Darth Caedus's, for the Sith Lord could not sense his sister Jaina Solo while she was near the ysalamiri. However, most Jedi and Sith find the ysalamiri distasteful, Mara and Jaina among them. Grand Admiral Thrawn used the ysalamiri both as a way to oppose the Jedi and in order to control the Dark Jedi Joruus C'Baoth.

           Star Wars Villains

Bounty Hunters
Aurra Sing | Bazine Netal | Boba Fett | Bossk | Cad Bane | Dengar | Embo | Highsinger | Greedo | IG-88 | Jango Fett | Zam Wesell | Moralo Eval

Confederacy of Independent Systems
Leaders: Darth Sidious | Count Dooku | Nute Gunray | Passel Argente | Poggle the Lesser | San Hill | Shu Mai | Wat Tambor | Po Nudo | Tikkes
Military Leaders: Admiral Trench | General Grievous | General Kalani | Lok Durd | Riff Tamson
Other Officials: Asajj Ventress | Durge | EV-A4-D | Gizor Dellso | Jenna Zan Arbor | Keeper Agruss | Miraj Scintel | Osi Sobeck | Sora Bulq
Soldiers: Battle Droids | Super Battle Droids

First Order
Leader: Supreme Leader Snoke
Officials: Captain Phasma | General Hux | Kylo Ren
Soldiers: Stormtroopers | FN-2199
Other Officials: Carise Sindian | Unkar Plutt

Galactic Empire
Leader: Emperor Palpatine
Sith Lords: Darth Vader
Inquisitorius: The Grand Inquisitor | Fifth Brother | Seventh Sister | Sixth Brother | Eighth Brother
Imperial Officers: Admiral Garrick Versio | Admiral Ozzel | Admiral Piett | Arihnda Pryce | Commander Moff Jerjerrod | General Veers | Grand Moff Tarkin | C.A. Motti | Grand Admiral Thrawn | Admiral Kassius Konstantine
Other Officials and Operatives: Agent Kallus | Mas Amedda | Orson Krennic | Iden Versio | Gideon Hask | Commander Bacara | Commander Cody | Naare
Soldiers: Death Troopers | Emperor's Royal Guard | Stormtroopers | 501st Legion

Other Sith and Fallen Jedi
Barriss Offee | Darth Maul | Pong Krell | Savage Opress | Son

King Adas | Almec | Cornelius Evazan | Garnac | Gorog | Hondo Ohnaka | Jabba the Hutt | Maketh Tua | Moralo Eval | Ponda Baba | Sarlacc | Sebulba | Slick | Teedo | Zillo Beast | Ziro the Hutt

Other Small Organizations
Black Sun: Ziton Moj
Death Watch: Tor Vizsla | Pre Vizsla | Bo-Katan Kryze
Guavian Death Gang: Bala-Tik
Kanjiklub: Razoo Qin-Fee | Tasu Leech
Nightsisters: Asajj Ventress | Mother Talzin | Old Daka | Zalem
Partisans: Saw Gerrera
Trade Federation: Daultay Dofine | Lott Dod | Nute Gunray | Rune Haako