Gold Experience Requiem
Gold Experience Requiem is the second stand of Giorno Giovanna. It is the evolved form of Gold Experience.
About
A new stand created by piercing Gold Experience's body with the stand-creating Arrow. Gold Experience Requiem's ability is to turn anything, including his opponent's attack and willpower, back to the state of "zero". Hence, it is near invincible, as all "supposed" actions created by an opponent would have been reset (back to point zero). If the opponent is killed by the stand's attack, then they will also continuously experience death, as they will die but repeatedly return to point "zero". It is mentioned by Giorno himself that he is unsure of the exact workings and limits of Requiem's powers. Requiem also appears to have a consciousness of its own that is unknown to Giorno.
In other words, Gold Experience Requiem has the opposite effect of King Crimson; while King Crimson erases the "cause" while keeping the "effect" (i.e time where a bullet would hit him is erased, causing the bullet to warp past him), Gold Experience Requiem keeps the "cause" but erases the "effect", thus causing endless scenarios where the opponent would normally die, but is then placed in the next scenario before he/she does (i.e Diavolo"s "deaths" via GER's Blazing Fists, the knife of a heroin addict, an autopsy, being hit by a car, and so on for eternity.)
This ability turns Giorno essentially untouchable by anything that would try to hurt him and is perhaps the strongest defense ever in fiction.