Unfortunately, there's a ton of problems with most of your "hints."
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1. Do not union!!! It's so easy to pick a ''useful'' card (anything else than Revolution) and run to a bridge with Durant alone.
Ignoring a key element of the battle system is a horrible idea. First, you'll have to deal with the battle penalty, and then you will find yourself unable to take advantage of it since, you know, you'll only be using one unit. And bridges aren't exactly common.
The spoilers that follow are very minor, but I'm being careful since Kelia specifically asked for no spoilers.
» Click to show Spoiler - click again to hide... «
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Don't get me wrong, they are both weak. Roswell is better, because he can defeat Aegina, X-formation costs less movement and he can wear the boss badana(Always Ace) in order to manage your first meeting with Gulcasa without morale damage.
They're stronger than Durant, and Roswell is NOT better. Rosary will actually have an easier time against Aegina, anyways, since she doesn't have to deal with being weak to holy. And I'm not sure what you mean by "X-formation costs less movement" so I'll just ignore that for now. And, uh, the Boss Bandana isn't going to help you much against Gulcasa. I'm not sure what makes you think it will.
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Do not ever use such fucking cards like Revolution :-(
You must have forgotten that Refreshment exists and is the worst card ever. :(
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Really helpful cards with high movement are Sanctury, Chariot and Gravity Chaos.
Why would you want cards with high movement if you're not going to be using unions the way they're meant to be used? You'll end up starting with such a low amount of aggression. And it's not like you can rely on earlier clashes in the union, since you... aren't using unions properly.
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Overskill and geo advantage is so much win while union causes only morale damage. ;-)
Card skills and geographical advantages don't do anything more than cause morale damage, either, in the end. Well, except for Steal, Item Break, Earthquake, and Medusa Eye. But you're relying on Durant, so those aren't options. How does your comment make any sense? I have surely missed something, so please explain.
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3. To find all treasures you have to move step by step and explore the map with useless cards when the enemy doesn't want to attack.
That's a great idea, to waste all of those turns. Well, if you don't care about getting the MVP bonus, anyway.
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4. Gulcasa: Always the same. Find a way to curse him with Gravity Chaos. ;-)
False. You must not be very far into the game if you think Gravity Chaos will solve all of your problems with Gulcasa.