JK-13 security droid

Also known as the "Jedi Killer." They were manufactured on the planet of Ord Cestus. The droid was first designed to be a security droid. The droid is part of the category of bio-droid because it uses a living ciruit design incorporationg organics into the core processor, allowing greater empathy with the owners and superior tactical aggresion toward intruders. The processor is actually a life-support unit for a creature known as a Dashta eel.

The dashta appears to be nonsentient, which in some ways is even more amazing, representing the first nonsentient creature ever found with a profound level of... well, of Force sensitivity.

The JK is able to do something no other droid can do, that is to anticipate attacks. In the book "The Cestus Deception," Kit fisto participates in a demonstration of the droids capablity to, "Kill Jedi." Of course Kit overcomes the droid, but the droid used techniques like luring it's opponent into a false sense of securtiy while it digs underneath them with their leathal tendrals. The droid had the ability to absorb plasma bolts rather than deflecting them making them a deadly rival for Jedi and clone trooper alike.

Count dooku planned on importing tens of thousands of these monsterous droids, disregarding their niche of security droid rather than battle droid.