It was a ritual the King had to hold if he wanted to communicate with the Moon God. The High Priestess must perform the Moon Dance, and if the Moon God was willing to grant the King's wish, then he would descend from his throne on the moon before he would possess the body of the High Priestess.
The movements of the Moon Dance were very simple, but the incantations chanted by the High Priestess were the most important in the ritual. Only the High Priestess knew the spell to summon the Moon God, and that was why the ritual depended so much on the High Priestess's performance.
It was the same High Priestess who was possessed by the Moon God more than eighteen years ago when the Moon God stepped down from his throne and told people about his prophecy regarding the first Crown Princess Grinia. Thus, it could be said that the High Priestess was very experienced, and that was why even King Gerold was confident that he would be able to communicate with the God tonight.
