@nomakgaming_ttv"You’ll now be able to level up your Battle Pass in both Battle Royale modes and Arenas. Challenges will now be either general (achievable while playing both Arenas and BR) or specific to one of the game modes.
Since we know some of you may only want to play one mode or the other, you can re-roll daily Challenges and choose for the new challenge to be for Arenas or Battle Royale. We’ve also made the first re-roll of the day free (additional ones still cost Legend tokens). We hope that—as with the rest of the Challenges system—this change strikes a balance between encouraging experimentation and allowing you to play your way. "
From Arena blog
