Nyx

Nyx is the primordial goddess who personifies the night. She co-rules the underworld alongside Hades and is more involved in the state of the realm itself than its inhabitants. She deeply supports Zagreus' desire to leave, and will grant him the "Mirror of Night", which will aid him in his quest for answers and self-discovery. Although the chthonic gods represent darker aspects of humanity's reflections, and for this reason the Olympians dislike Nyx and fear her, Nyx is considered benevolent, approachable, and maternal towards Zagreus. She was the first to unconditionally support him and contact the Olympian gods to help him escape. She never felt comfortable lying to him, unable to look at Zagreus without feeling guilt and responsibility for the conditions that bind him to the kingdom. It is implied that Nyx may know even more than Hades about Persephone, but cannot tell him because of Hades' prohibitions, so he will have to discover the mysteries behind his mother's disappearance and himself on his own.