Once upon a time the gods built a barrier to their realm.
And every day, just after sunrise people would gather to try and break down the barrier trying to become immortal.
Until one day the gods sent down a bolt of lightning killing the entire group instantly.
And because this word spread about how greedy and vengeful the gods were and how and they were unwilling to share their realm.
And because of this people stopped placing their faith in them, stop praying to them and stopped worshiping them.
Until finally the gods felt the power stating to wane, and it became increasingly difficult to maintain the barrier.
And ever since that day the gods have offered to open the gates once a year to anyone able to prove themselves worthy through a series of trails and tribulations.