Pelko bug
From Wookieepedia, the Star Wars wiki.
Pelko bugs were small creatures that were covered in millions of microscopic barbs that delivered a paralytic, blistering toxin which could penetrate armor. They lived only beneath sands of the Valley of the Dark Lords on Korriban, and were attracted to Force-sensitives. They would stalk and swarm their prey in the darkness. The bug's attunement to the force allowed them to determine if a creature was suitable prey, as Darth Bane found when exploring the Valley (They found he was too powerful and did not attack). The barbs were used in training sabers at the Sith Academy because of the toxin's effects, which mimiced the effects of losing a limb to a lightsaber
[edit] Behind the scenes
"Pelko" means "fear" in Finnish.
