The rebirth of sisters

Once upon a ring....   three sisters together in a distant land with strange animals and stranger folk. However the folk grew wary of the sisters over the centuries, the began to spread lies and horrible rumors about the sisters. The sisters where different from most folk, also amongst themselves they differed but they where also very similar to each other. One day they received an unusual visitor, A small man with the presence of something a lot larger, he told them that he was sent by the people to rid the lands of their evil ways. He knew however that the sisters where not truely evil. Reluctanty they choose to leave their home. They traveled to a mirror of their world. The three sisters found themselves in a war torn kingdom. They could easily find people to trade favors with thus making them and force to be recon with. People would first ask for something small, the sisters would ask a for a small favor in return, but once they had made a deal. You would more easily return asking for another favor. One such man diceded he wanted to be king. He traded his firstborn son to them and became a king, he managed to unite the land through force. The boy was never heard or seen from again, so be vary of the sisters. If you deal with them you might not be told the price in advance. I manage to leave but at what cost?