The fiery spinning cage was inescapable, because it was able to reflect any GN force that was thrown at it.
The spell was extremely taxing on Guan Dongyang's system. He gritted his teeth and endured the pain from rapid depletion of his soul energy. He knew he had only one shot at this; so, he swallowed down the pain and carried on the spell without hesitation.
After ten minutes, Guan Dongyang finally stopped the spell and descended to the ground. He didn't even have enough soul energy to stay afloat. The fiery ball slowly disappeared, and something dark fell from the sky, thudding on to the ground.
Nihlathak's flesh, bones, and his super METAL were melted altogether and reduced into a clump of black matter the size of a dog.