Heroist
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Actually, when you think about it, the idea isn't bad. The road through the pass is the only one, and there's no one else for many miles except the jailers. If they come to help, it will be the same battle without a barrier, but with fewer enemies and outside the castle walls. On the other hand, it's unknown how they will react, and it might even be worse. You can ask the main character about this, though.
Whatever