I'm looking at Time Stop and wondering if there is any way at all to modify the rolled d4+1. I know that Extend Spell doesn't work because the duration is Instantaneous despite the extra rounds it gives you to act.
Any RAW feature, item, or spell by WotC that will allow someone to modify (or re-roll) a die, without requiring that die to be a d20, ability check, attack roll, saving throw, or damage is a helpful answer to the main question, even if it for some reason specifically can't or doesn't work with Time Stop which gave me the idea for the question.