It was hidden in the cavern behind the basement of the Portrait family's house and was discovered by the Guardians. The seal is absorbed by the Heart of Kandrakar to save the girls' lives. It is used to open portals but it eventually becomes useless. It was the symbol of the royal family of Meridian, so that Cedric and Elyon uses the symbol of the Seal of Phobos on their clothes, he also seems to have a conscience itself, and is capable of delivering powerful beams of dark energy, or a kind of black mud (true form of evil, according to Oracle).