Most swords in OP are made of steel but not all have the same quality and strength. S-Hawk's blades are as strong as his body and not even a Yonkou can scratch a flame on Seraphim without going all out.
I think S-Hawk is going to get awakening in record time because of the whole human sword thing but there's no chance he gets a black blade.
I think S-Hawk is going to get awakening in record time because of the whole human sword thing but there's no chance he gets a black blade.