octogone and anyone else having trouble against the worlds saviors let me give you a few tips
1. attack them one at a time and exploit their weaknesses such as what elements they are weak to and either low physical or magical defense. aalia should be your first target and bartholio should be your last.
2. if they keep killing you on the opening go maybe you should check your characters defensive skills. are you mastering them? you should be.
3. make sure everyone has healing potions not just mardek. also this is pretty basic but in case you didn't know healing spells can be used on everyone at the same time, though it costs double the amount of mp.