13 Seekers of Darkness

The true Dominion XIII (真のXIII機関 Shin no Jūsan Kikan), also known as the thirteen seekers of darkness (13人の闇の探求者 Jūsannin no Yami no Tankyūsha) is a group consisting of the most insidious demon lords and lich kings assembled from across time and space at Lord Chernabog's request. There have been many different members over the years, but the core number of their leadership is always an unlucky number of 13. They are the true Big Bads of the first saga in the Kingdom Hearts Unlimited Saga.