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Arjien, you shouldn't have bothered with the Tear. It's better to capture all the castles, level up both heroes, and get all the dark magic spells for Shadia from the treasure rooms and utopias. And if there's nothing from Chaos in the castles, you should also visit the treasure rooms and utopias with Railagu. In the next mission, it's better to have two heroes leveled up to the maximum. There will be enough work for both of them. And now, as soon as you capture the last castle, the mission will end immediately. Of course, you can block the last castle with one hero so that no one can get out. But that's not very convenient. It's easier to focus on leveling up and getting spells when no one is interfering.