Enkafos Ynkeyinum was a being gifted with the ability to inspire great fear. He was selected as a member of the Sinestro Corps and was based on the sentient planet known as Ranx. Enkafos took great delight in overseeing the torture of slaves in the territories dominated by the Sinestro Corps. Enkafos worked closely with the psychokinetic Children of the White Lobe and the Sinestro Corps' militant training instructor Arkillo. During the Sinestro Corps War, at the Battle of Ranx, Enkafos slew rookie Green Lantern Chthos-Chthas Chthatis. It was at this time that the Guardians of the Universe rewrote the Book of Oa enabling the members of the Green Lantern Corps to use lethal force against their opponents. Neophyte Corpsmen Sodam Yat avenged Chthos' death by forging an energy scimitar with his ring, which he used to cut Enkafos in twain, killing him. During the Blackest Night, the battle between the Sinestro Corpsmen, led by Sinestro, and the Star Sapphires was interrupted by the arrival of the Black Lantern Corps, made up of the many Fallen Sinestro Corpsmen, led by Amon Sur. Enkafos was one of the many present in the Battle of Zamaron.