He was a soldier that entered the Castle of the Damned to avenge a friend that was killed by Ardebaran. When the Prince of Zemekia first entered the castle, he and a soldier stumble upon Ardebaran. The soldier was killed, but Idorigo helped the prince escape. Later, Idorigo saw that the prince wore the ring of the castle, and believed he was an enemy trying to trick him. The prince used a Volt Cage to capture him, and he became the first sacrifice to the Lord of Darkness.