Dathka Graush

Dathka Graush was a Sith Lord that died c. 7,000 BBY. He was entombed on Korriban roughly fifty years after he had won one of the planet's periodic civil wars and established a dynasty that ruled over two-thirds of the planet. While he was alive he had his heart removed and replaced with a Force-sensitive crystal. His rule was excessively cruel even by Sith standards. Through Sith Alchemy, he created an army of servants out of dead bodies, Korriban zombies, that helped him estabilish his rule, which ended with his assassination.

Like most Sith of the period, his spirit was imprisoned in his tomb on Korriban along with his Sith sword, a holocron, and a Sith amulet. Exactly six months before the destruction of the first Death Star, pirate captain Naz Felyood crashed his ship, Jynni's Virtue, on Korriban. His ship logs indicated that Dathka's spirit was still around.

Behind the scenes
There is some degree of error present in the Wizards of the Coast article. It states that his death was 7,000 BBY, when that is impossible, due to the Hundred Year Darkness having recently begun at this point, with the Sith Empire not even having yet been founded. Since it is already established that Ajunta Pall was most likely the first Dark Lord of the Sith, Dathka must have become the Dark Lord immediately afterward.

Appearances

 * Korriban: Planet of Lost Souls