Won after a handful of tries using this formation, 137M Power

For rough comparison (although raw stats in image are the most important):
4x Justice Spirits on offensive toons, 1x LB on maria, Herja negligible
Level 45-47 on all equips (excluding Herja), except Adamanti Spirit (87), QP Spirit (50), Maria Spirit (16)
Vengeance, Intenseness and Advantage Runes at 12 for all offensive heroes, 10-11 for Preciseness and Endurance, 7-10 for all other runes

Damage ranged between 28.61% defeat to 60.50% victory