Ysalamiri
The ysalamiri is a small, arboreal, salamander-like creature that has the unique ability to push back the Force. It appears in Jedi Knight: Mysteries of the Sith and in the multiplayer mode of Jedi Knight II: Jedi Outcast.
When carried by the player in Capture The Ysalamiri, the ysalamiri makes the possessor immune to the effects of Force powers used against him/her. The ysalamiri also prevents the possessor from using Force powers.
In mods
In Lugormod, players can purchase the Ysalamiri Blast skill. This grants the players a ysalamiri powerup, or gives them the ability to target an enemy and use the ysalamiri against them. Additionally, some clan servers in Jedi Outcast use the ysalamiri entity as a marker for teleports.