Ysalamir

The ysalamiri (singular ysalamir) are a species of arborial, non-sapient, salamander-like creatures that have the notable ability to project a Force-neutral sphere around themselves within which the Force's effects on the physical world are minimal. A typical specimen is approximately 50 cm long, easily light enough for a man to carry. Keeping them in captivity requires the construction of scaffolding to simulate their arborial habitat, but even a small scaffold that can be worn as a backpack will suffice.

Captured ysalamiri have several practical applications, chief among them nullifying the powers of Jedi (or Sith). By nullifying the Force connection between clones and their original tissue donors, they allow the clones to grow to maturity rapidly without going insane. Grand Admiral Thrawn exploited both uses of ysalamiri during his campaign against the New Republic.