You will also want a character that can regenerate your other characters’ health, such as Noelle. If you do not have a character that can regenerate HP, then you will need a lot of food, and you will need to pay attention very closely.
If you must stand in the ice circle, you should have a shield to guard against attacks.
If you are directly in front, Andrius will slash you with his claws. If you are directly behind, he will use your tail to attack you and/or throw ice at you.
Also stay off the walls of the arena; while it can be used to attack Andrius without getting attacked, it will also be covered in ice after reaching the halfway point.
You can only complete this challenge once per week. The challenge resets at midnight every Monday.