For Dark Knight Commander's Resolve you can easily take down the Big Fatty before he even gets to start moving. Ninja / MF can reach him from around the bend and archers can reach him from the easternmost ranged spot in the little island on the top left, as well as the closest ranged spot to him on the right. You can then save the Commander's skill to deal with the final Mage Demon thing. I ended up first tanking him with Karma during her skill and then finishing up with Deine and Commander skill, never having to withdraw anyone other than Karma.
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