Apollo "working from afar". While Apollo presided over the prophetic powers and magic of light and heaven, Hecate presided over the prophetic powers and magic of night and chthonian darkness. If Hecate is the "gate-keeper", Apollo "Agyieus" is the "door-keeper". Hecate is the goddess of crossroads and Apollo is the god and protector of streets. The oldest evidence found for Hecate's worship is at Apollo's temple in Miletos. There, Hecate was taken to be Apollo's sister counterpart in the absence of Artemis. Hecate's lunar nature makes her the goddess of the waning moon and contrats and complements, at the same time,
The Trials of Apollo own robots. They then navigate the maze with the help of Piper McLean and Jason Grace and find defeat Medea, the sorceress who was working with the emperor. Around this time Caligula (the emperor) kills Jason Grace. The next day, Grover, Meg and Apollo using Caligula's shoes walk the Labyrinth. They free Herophile and discover a new prophecy: “Apollo faces death in Tarquin’s tomb unless the doorway to the soundless god is opened by...”. They also discover that they need help from ‘Bellona’s daughter’, Reyna, the praetor of camp Jupiter. "The Tyrant's Tomb" is the fourth book in the series.