Sovereign of Judgement is a Manga/Manhwa/Manhua in english language, Manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

On an ordinary afternoon, Ring suddenly appeared in the middle of the classroom. If you want to live, you have to climb up the ring and kill your classmates. A brutal slaughtering game that simultaneously tests human fighting power across the globe begins.