If we still have Challenge Count and the opponents left are all too strong, we can Refresh Opponet with a click of the refresh button.
There is a 3-minute cool down before we could click again to refresh.
Opponent refresh can be performed until Challenge Count exhausted. Challenge count can refill organically due time.
Or if you do not want to have and have extra gems, just toss 5 of them to instantly refill Challenge count to continue your quest of gold and glory in the Arena😎😎