Because of the battle with a certain intruder, he was heavily injured and on the verge of death.
The Dragon Transformation Body was severely injured by the Human Emperor's Battle Halberd. More than half of its bones and flesh were gone, and most of the dragon blood had been lost.
From then on, he never took a step out of his seclusion.
After cultivating in seclusion on the island to heal his injuries, he used up many medicinal pills that he had gained over the years to barely stop his injuries from worsening. It was really far from recovering.
Without the help of Earth-rank medicinal pills or precious healing treasures, it would take at least a hundred years of bitter cultivation to barely recover.
It was good to be reduced to a low-grade Divine Judgment faction. By hiding their strength and biding their time, they could avoid being spied on by the outside world.
Pew!