Shadows of Corruption is the fourth section of battle mode. It can only be unlocked after you complete the second story chapter. Currently, there are 23 bosses in this section. The easier bosses are Ohige Alien, Clover, Luni, and Meguna because most of their attacks are lower AOE (Area of Effect) damage. Make sure to bring a healer, 2 MP Boosters, 3 Ultimate Debuffs, and 1 Ultimate Buff. Also, make sure all your pet buffs are only HP and Defense. It is best to find units with high HP and Defense. IF YOU ARE DOING BOSSES WITH ELEMENTS, BE AWARE OF IT'S ELEMENT COUNTERS. However, teams can be adjusted to finish quicker based on their levels and skills. Recommended level: At least 50 or more