Cleansing One's Body
John sat on the light bridge in silent pain, resisting the constant pressure of the trial. The trial not only tested body, dantian, and soul talent, but also willpower. Only those with incredibly firm wills would be able to resist the pain of this trial.
Those with even slightly weaker wills would eventually be overcome by the trial, and either go mad, or give up. Either way, they would perish.
Even for John, with his great pain tolerance, the trial was driving him to the edge. However, he resisted the pain as best he could, while he allowed the mysterious pressure to slowly but surely cleanse and strengthen his body and soul.
John sat there with no concern for the passage of time. He no longer knew how long he had been sitting there, and no longer cared. His body and soul were going through immense changes, allowing him to ascend in power once more.