Every trial comes with a set mission, and upon completion, there will be a reward; if one exceeds expectations, then there is an additional generous reward.
As for the Xuxian Realm, it is a spiritual world, spanning the entire Tai Chu Realm's twelve hundred and ninety-six thousand domains, where numerous exceptional prodigies and demonic geniuses dwell. The entry threshold is the Divine Yuan Realm because only then does one cultivate the martial soul of Primordial Spirit.
Han Li had his descendants enter only after reaching the Tongxuan Realm as a precaution to avoid failure upon entry and the resulting blow to their psyche.
Over the years in hiding, Han Li had acquired many treasures, one of which was a magical treasure named "Door to the Xuxian."