>>17879607How exactly are you failing?
I dont even remember what the trees do but at one point one of your sinner will be trapped by a clash attack (forgot whicho ne is it). Better to use the weakest sinner for that because it will get that Dazzled status for 2 turns and randomly attack allies. For the final tree attack (when all of your sinners are captured except one) just clash with her.
As for the clashes themselves, if you use the strongest skills 1st and 2nd turn before you gain some SP, it should be easy to win every clash