To evolve from the Seventh Order Bronze Warrior to the Eighth Stage, one must rely on powers other than Special power to complete the transformation. Of course, the power each person draws upon is different, and therefore the forms they take after the transformation are also distinct.
With the power of Thunder, Su Yu's pair of Spine Bone Wings finally underwent a successful metamorphosis; with thunder serving as the bones and Special power as the flesh, they transformed into a pair of "Thunder Wings" that appeared bronze on the outside but contained the power of thunder within. His skill of bone wings evolved once more, reaching the ultimate realm of Thunder Wings.
