Maria is a fragment of Lethe's mind - a physical representation of her emotions. She presents as a Minotaur.

Maria was found by the party in Romana's casino - emotionless and passively gambling. They soon figured out that Romana had extracted her emotions and was using them to manufacture illicit drugs that she sold within The Endless Market. After her emotions were liberated and had merged back with her, she accepted being returned to the Synergy Group for her own safety.