The New Sith Empire was founded by Darth Ruin, and was the vast area of galactic territory formed out of the Fourth Great Schism, which the Sith ruled over with an iron fist.
At some point, the Sith Lord Quorlac Fornayh began attempts to place himself as the ruler of the Empire. In order to gain the necessary advantage, he began using Sith alchemy to mutate Rancors into fearsome war beasts known as Coloi. However, this long process meant that he grew old and by the time his creations were ready, the Empire was slowly defeated by the Republic. In order to survive, Fornayh left his creations in stasis and his spirit remained in existence where it waited for the opportune time to resurrect himself by transferring his essence into a clone body.