The Hill of Three Gods

In the lands of the Fertile Crescent, people have long cloistered themselves during the "new moon" phase, when the star disappears from the night sky. For a few hours, a terrible demon incarnates on Earth to prey on the weak, the dying and even newborn babies. But one day, a man arrives in the valley of Balikh: he is the last grandmaster of sacred sounds. In 9676 BC, he had a stone temple built on a singular hill. Thirty men joined him to become his disciples. Like their master, they were flautists and played a strange kind of music. Legend has it that the famous hill was home to three inseparable gods, responsible for stabilising the forces of nature. But one day, one of them suddenly disappeared.

What happened on the hill ?