Board Thread:Questions and Answers/@comment-26029790-20150121155906/@comment-25179062-20150122165225

You need three things to beat Trial 003: [1] get past Juggernaut and Abaddon (status removal/prevention helps); [2] survive the huge damage Maxwell deals; [3] after you kill her once and she revives, you need to deal enough damage to finish her off in less than three turns.

For #2 (survival) you need units with HP over 7500 (after spheres and leader skills), a healer, and damage mitigation/reduction helps a ton. Darvanshel, Oulu, Narza, and Shera who all have a BB which mitigates/reduces damage by 50% for one turn. Elimo is not as good because she reduces damage by only 25% and only with her SBB, which means you will probably not be able to mitigate often enough. Elimo's defense boost is not very useful because many of Maxwell's attacks ignore defense.

Do you have friends with the mitigator units as leader? If you simply cannot use a mitigator, try a leader and friend who either reduce damage or boost HP (or both, like Grahdens). If you don't use a mitigator, you will need to guard all units every turn that Maxwell has defense ignore (Sacred Song) active and turns where she will cast Destiny. A turn counter helps for this: http://touchandswipe.github.io/bravefrontier/maxwellcounter.html