Big Band's daily event is bullshit. You created a situation where the opponent has infinite unflinching and invincibility when armored for a character that doesn't have armor breaking or debuff removal. If you're going to challenge the players, then at the very least have it around what that character can do to consistently counter it. A more reasonable challenge would have people gain armor to increase their damage output or reward us for successfully stunning the opponent. You want to stun them because the opponent has a constant regen and the stun removes the regen for 15 seconds.