Sodam Yat is a prophesied future member of the Green Lantern Corps, created by Alan Moore and appears initially in "Tygers", a story in Tales of the Green Lantern Corps Annual #2. He is mentioned in passing to Abin Sur by a demon named Qull of the Five Inversions, who had been imprisoned on the planet Ysmault by the Guardians of the Universe. As a Daxamite (a race with inherent Superman-like powers) with a power ring, he would be nearly unstoppable. Despite this, in Qull's prophecy, he is still defeated as part of the final destruction of the Green Lantern Corps.
He is also mentioned in the proposal Alan Moore wrote for his series "Twilight of the Superheroes", which was never published. In the proposal that was leaked onto the internet, the Daxamite Green Lantern is named "Sodol Yat" and is also referred to as "The Ultimate Green Lantern". In that story, Sodol Yat is the last Green Lantern to confront Superman, who has just killed many Green Lanterns, Thanagarians and the Martian Manhunter. Sodol Yat then kills Superman.
Sodam Yat made his first appearance in regular DC continuity in Green Lantern Corps #12, and part three of the Sinestro Corps War (Green Lantern Corps #14), when Kilowog gathers a group of Lanterns to strike back against Sinestro's forces attacking in Space Sector 2263. Salakk singles out Arisia to keep an eye on the newly graduated Lantern Yat, while she wonders why Sodam is so important. Salakk has been charged by the Guardians of the Universe to keep Qull's prophesy from coming to pass, but keeps this to himself, only saying that one day she may know why he is so special. In Green Lantern Corps #16, Sodam destroys Ranx' core ending the battle of Mogo