In the distant Middle Ages, people were still living a very peaceful life. That was thanks to the knights who were trying their best to defeat monsters day and night. In this world, many conspiracies were built on magical power. Heroes used human strength to overcome unnatural power. Hero Legends: A Summon Saga tells the story of a war in which evil magicians could summon an army of undead. The court magicians had to do their best to protect the knights. This was a large-scale strategic war. Many forces that could shake the heavens and the earth fought each other.