This is a trial you will instructed not to speak of outside of those who aren't in the association. In this trial you will be descending The Tower. This trial will be rigorous but primal at all costs!! (The trial part is the one that is secret, the public only knows that the Hunter exams have three parts. So Hirar didn't leak the info about the tower to his brother. Because this is only a exam area that the association uses its many of its different exam setups.)