You should know that under the amplification of the Heart of Eternity, all of Long Dangdang's equipment was enhanced. His Adamantine Cathedra battle armor, in a sense, was already very close to the power of God's Seal Cathedra Rex. When he ignited the Luminous Smelting Furnace, he could clearly feel the moment his inner spiritual power caught fire. A vast Divine Luminous aura burst forth from within him, instantly turning the entire cave golden.
He had never felt himself to possess such formidable power. Unable to test, he didn't know the extent to which his spiritual power had reached, but he was completely confident that if he faced the Hall Master Divine Lightning of the Assassins Temple again, he would have the ability to crush him, most likely without expending too much effort.