In a sidequest that centers on Alice and Decus, it is revealed that Decus and Alice were both orphans who lived in Hima. Eight years before the story, Decus was accused of robbing some travelers. As it turns out, the culprit was the orphanage owner and his three sons, but no one believed Decus, and so the travelers attacked him. Just as they were about to kill him, demons attacked the orphanage, and it was burned to the ground, killing many of the people inside. In the present, Decus reveals that at that time, Alice made a pact with a demon to save Decus, and she learned to summon and control demons and monsters because of this. However, in the original Tales of Symphonia, when the player goes to the Niflheim book optional dungeon, it is revealed that when Lloyd's group burned the book, it destroyed the pact Alice had with the demons and thus explains why she needs machines to control monsters now. Since that day, Decus swore his heart to Alice as repayment for saving his life. Even though Alice rejected him and his request, Decus continues doing everything for Alice and helping her whenever she wants, making it often look like he is her mindless slave in the present timeline.