The Gods and Goddess of old were concerned for the fate of the universe. A lot of the younger gods and goddess weren't being trained the way they should be. So parents over trained causing their kids to rebel. Others did no training which lead to the next generation not knowing what they needed to do. This imbalance was a threat to them all. So they came to an agreement. All gods between 16 - 30 human years would be sent to a school which would give them all equal access to the knowledge they needed to take their places in the universe. All pantheons agreed to that their would be a truce on the school grounds. No student or parent could attack another while on the grounds. All grudges and alliances were to be put aside while on school grounds.