Board Thread:Questions and Answers/@comment-24919788-20140509022515/@comment-5914413-20170805091627

Isn't that one just blood related? His shikai even has an attack that is called blood mist shield. As for his bankai, blood keeps regenerating ( i know it is more then that, but i am trying to keep it as simple as possible ) so by kicking that regeneration up to eleven, and some stretching of the healing part, you can strengthen the body part that gets healed. Scleroderma is one potential option for the strengthening of skin where-as the offensive increase potentially comes from rapid healing of micro fissures that usually arise from exercise. If others have a better idea or theory, i am still interested.