Korriban zombie

The legacy of Dathka Graush, the ghoulish "zombies" encountered by the crew of Jynni's Virtue, are the result of Graush's experiments in Sith sorcery and the dizzying amount of raw material (corpses) to work with. They lay dormant until disturbed by Captain Felyood's theft of Graush's Heart. Unlike simple Sith spirits of possession, Korriban zombies can spread like a disease thanks to a ravenous appetite for living, sentient flesh. Fortunately for the galaxy at large, even Emperor Palpatine never learned the secrets of their creation, so for now these Sith ghouls are confined to the tombworld.

Curiously, the Jedi researchers that found the logs of the Virtue found no evidence of zombie activity. But since they also found no sign of Graush's Heart, the return of his Korriban zombie army is a danger to anyone who sets foot on that world.