Sukuna was introduced in Jujutsu Kaisen in the first episode and has been a major player within the storyline since, possessing main character Itadori Yuji as a vessel and dooming the teen to an unsavory fate. Despite being the series' longest-standing antagonist, very little is known about the King of Curses' innate technique. He frequently uses Dismantle and Cleave, two abilities that allow him to form slashes with his cursed energy, and has also used Fire manipulation. Though, aside from his domain, this is all Sukuna has revealed.
Source：https://www.cbr.com/jjk-sukuna-cursed-technique-best-kept-secret/
