#1 Posted by Kimikirai (954 posts) - - Show Bio

Giorno's ability is as follows:
His stand Golden Requiem reduces his enemies attack, willpower, action, etc back to zero. Thus, they never did anything to begin with as all supposed actions never happened. Never existed. If his stand kills you, the person killed will die forever in different realities.

Example of his powers in use: He defeated King Crimson, who can predict the future 10 seconds ahead, and erase whatever actions have happened (leaving the person paralyzed and thinking they did the action). Giorno defeated him because Diovolo (the user of King Crimson) never had the intent to use his ability against Giorno since his stand brought his intent to 0.