Not only was his physical body growing, but his Spiritual Energy was also growing faster under the nourishment of his cultivation.
Just as he was about to enjoy the benefits of his breakthrough, the power of heaven and earth nearby suddenly changed, and a dark cloud condensed out of thin air.
Song Shi sensed it and sent his Divine thoughts out. He realized that there were thunderclouds gathering, and the target of these seemed to be him.
"This doesn't make sense. I broke through on my own. Why is there a lightning tribulation?"
He was a little depressed because he felt that he had to undergo the Lightning Tribulation in order to truly breakthrough.
After passing it, the Golden Core would be formed.
If he could not cross it, he would be injured at best, his cultivation would regress, at worst, he would be reduced to ashes.