You can choose to re-roll the Winds of Magic dice in your turn. However, if you do so, your opponent can also re-roll the Winds of Magic Dice in his turn, if he wishes. In either case, all Winds of Magic dice must be re-rolled.
Source: Warhammer Fantasy: 8th Edition
You can choose to re-roll the Winds of Magic dice in your turn. However, if you do so, your opponent can also re-roll the Winds of Magic Dice in his turn, if he wishes. In either case, all Winds of Magic dice must be re-rolled.