The princess is being held in this castle. We tried to siege it two times already, but we failed miserably. It’s one of the strongest fortifications in these lands. Its walls was built with magic. The weapons of the defenders are all crafted with spells. However, during the last battle, you managed to capture an old mage. He said there was a way to bring down those walls. There is a weakness. If one is to play on any musical instrument, the walls will tremble. If a whole army does it, the walls will fall down. But where do we find musical instruments now?