Krath was a fictional character from children's fairy tales that were popular around the time of the Great Sith War. He was portrayed as an evil magician-god.
Tales about Krath were told to the Keto cousins during their youths. When the two Force-sensitive relatives grew up and were lured to the dark side of the Force, they founded a dark-side secret society and named it the 'Krath' after the character. Their yacht Krath Enchanter was a direct reference to the character.