About me: Helios is the high-priest of Elysion during the Silver Millennium when Prince Endymion ruled the Golden Kingdom of Earth. Helios remained in Elysion at the shrine along with the priestesses, the Maenads, when Endymion left for the surface. He is the Prince's guardian priest and this connection to Prince Endymion and the Earth and his own connection to Elysion makes all four entities connected.
Before the start of the Dream Arc, Helios receives a vision from Princess Lady Serenity telling him it was time to awaken the Golden Crystal and describes a maiden protected by moonlight who could help do so. She also warned him of a great trial awaiting him and Elysion. Over a long period of time, the Dead Moon Circus slowly conquered Elysion. Helios was captured by the Dead Moon, turned into the form of a pegasus, and cursed along with the land. Helios is locked in a cage by the Dead Moon and has a great black rose growing in his lungs from the curse. His connection to Endymion makes this curse pass to him as well. The Maenads were protected from the curse by the purifying crystals of Elysion that they slept inside. They and Helios were the only survivors.