There are 2 types of Special Missions that will be opened every day. The time the events open will be displayed in the event countdown timer.
You can get valuable materials, money, and experience items in these missions.
Each type of mission can be finished between 2 to 5 times per day after they open. Different difficulty levels will have the same number of battle chances.
Each week, there will be a designated day where all the Special Missions will be opened, so be sure to check the countdown.