Board Thread:General Discussion/@comment-25156739-20150914163822/@comment-45414938-20200830061257

However, range probably limits what it can affect (I doubt GER can use RtZ on something across the planet). Additionally, it's control over causality has limits. If Giorno cancels a cause, he cancels its effects, too. This is presumably why he couldn't bring Bruno or Narancia back: it would change their fight and hence they wouldn't defeat Diavolo. It's actually possible that speed and range doesn't matter (meaning if possible, he could actually negate something from worlds to basically anything in the universe). Well, the only time GER lost was when he fought Heaven Ascendion DIO.

"This is presumably why he couldn't bring Bruno or Narancia back"

This was way before Giorno obtained GER. He can only cancel attacks and willpower.

​​​​Giorno said that Narancia's soul already ascended. Bruno chose to ascend.