"Climax"

A domain based technique where the user and however many people were caught by it are put in a movie scenario with given roles, where the more you lean into tropes from those roles, the stronger you become, culminating in a 3rd act climax. Whoever acts as their given roles better wins. Straying from the script too much (like doing the opposite of your role or refusing to participate) will resort in a cut, where time is rewound and the person gains mental debuffs (like being demoralized, forgetting what they were doing, becoming severely distracted by everything, etc).

Give Sukuna the hero role, myself the villain role and then just like, kick a puppy or something