The toughness of Diana's bones is something Han Dong has personally experienced, and it is definitely harder than steel.
"Butcher's Cut"
Two of Diana's fingers instantly detached, flying in the air...
The cut on the bone is incredibly smooth, seemingly unopposed.
If Diana's danger sense and body reaction were a fraction of a second slower just now, her right forearm might have been gone entirely.
"What's up with this monster?"
She herself had never encountered such a situation... moreover, after Breaking the Breed, the hardness of the bones has reached a higher level.
Facing such an existence, her bone defense is no different than ordinary flesh. A mistake could lead to her execution.
She changes her stance, abandoning close combat.
During her retreat, the density of the bone within her body is rapidly changing.
"Bone Elongation"
Her unique bone traits along with her Breaking the Breed ability, allow Diana to create various forms of bone constructs based on her will.