They were all golden Immortals, but each golden immortal had at most one gold immortal artifact. However, Dao ancestor void had two gold immortal artifacts, one of which was a Supreme-grade sword artifact. Its offensive power was unparalleled, and the two golden Immortals of the heavenly light great world could only join forces to deal with it.
After Daoist heaven devouring had arrived and met up with immortal Long Yuan's clone, he had completely understood the situation and changes in this world. He knew that Dao ancestor void was the key to taking over this world, and Daoist heaven devouring had not even cast a heavenly Dao net.
Having one more gold immortal item was completely different from having one less gold immortal item. For example, the sky-devouring gourd, which could hardly kill a demon of gold immortal level even when it was a perfected heaven immortal item, could easily devour a demon of gold immortal level now that it had been upgraded to gold immortal item.