Board Thread:Manga Discussion/@comment-39718735-20200516000645/@comment-45447954-20200824174954

Daedalus100 wrote: There's not really an answer, so all we can do is speculate. I'd say that (due to fate) Giorno's hand bled because he was worthy of the arrow, just not yet. Meanwhile, Diavolo was never fated to gain the arrow; therefore, it just simply rejected him, as he was and never would be fated to be worthy of its power.

As for the different design, maybe they all have different designs. We know that the arrow from Part 3 is the same one we see in Part 4 (I BELIEVE, I could have gotten something wrong but I don't think I did), so maybe each separate arrow had a different design, but the same abilities. I think you are wrong about the seperate disgn but same function. As you can see in this panel from part 5 the arrow looks the same from the one in part 4. So the arrow dont have diffrent disigns