Honkai: Star Rail‘s 3.0 update added a handy new reroll tool in the Variable Dice, but how exactly do they work? 3.0 was a huge update for Star Rail in many ways, principally with the story moving on to the Greek-inspired planet of Amphoreus. This came with adding a new Path, Remembrance, focused on units with summons. The first two characters following this Path are the Trailblazer and the upcoming 5-Star Aglaea. 3.0 also sees the full reveal of The Herta and her best builds in their 5-Star Emanator status.

https://screenrant.com/honkai-star-rail-how-to-get-use-variable-dice/