Emperor Hao Tian was indeed invincible during the Third Void Era. Although he did not have a Supreme Dao Fruit, he had a Great Dao Fruit and could achieve Extreme Sublimation.
After sublimating to the limit, he could summon the power of the Origin World's Door and obtain the full support of the Heaven and Earth Great Dao. He was completely invincible in the current world.
Most importantly…
During the Third Void Era, because they had only experienced two Eternal Limitless Tribulations, there were only two Origin World Treasures in the entire Void Universe Sea. Moreover, they were left in a corner of the Void Universe Sea.
Until the end of the Third Void Era, when the calamity was about to arrive, two Origin World Treasures were sent out and ultimately landed in the hands of the Immortal World's Lord and the Eternal World's Lord. They each obtained an Origin World Treasure.
