Benusta:
Rebels of the Ashen Shadow Camp have infiltrated into Gludin. Please eliminate them as soon as possible.
You need to select the difficulty after entering the zone. Regardless of the selected difficulty and your results you cannot re-enter the Ashen Shadow Camp instance zone until the access limit resets at 06:30.
Keep in mind that you can reenter the zone during the battle, however if all the party members leave the zone, they should re-enter it within 1 min.