Darth Disea was a Dark Lord of the Sith who was an apprentice of Darth Noir. He had previously been a Jedi Padawan but had been unable to advance beyond this rank. Convinced that his masters were holding him back, Yunn (as he was called then) went into self-imposed exile. He was found by his closest friend, Tysaa Utai, on the planet of Dathomir where Yunn had been drawn in by the Dark Side. He then dueled and killed Utai before leaving for Malachor V, as he had learned that there was a Sith Academy there. Here he studied at the foot of Darth Corruticus and his apprentice, Darth Noir. Noir took a shine to the young fallen Jedi and made him his apprentice, bestowing upon him the title of Darth.