>>717767741
>>717767826
It's explained that the arrow reacts to extreme emotions, mainly desperation, of stand users. For example, Kira needed a counter to Jotaro's time stop, so the arrow gave him a load saved game ability. This makes him kill the Jojo gang in the 'original' timeline, but thats another story. Same thing happened with Giorno needing a way to thwart Diavolo's ability to fix events to his benefit, with the arrow bestowing him the power to trap him in a fixed, set-in-stone, reality (well, an endless number of them). The arrow will only make the stand more powerful if certain circumstances are met