Kuro Chi

 Users of this technique never bleed

Kuro Chi  ( " 黒血" Literally meaning "black blood" ) is a technique that combines the powers of Busoshoku Haki and Tekkai.

The practitioners would use Busoshoku Haki to harden their veins and use Tekkai to harden their muscles at the same time, thanks to this, the practitioner would gain an exetremly powerful defence. Naturally this technique requires a great deal of concentration to perform.

When this technique is used, the practitioner's veins become visible and dark, which earned it the name "Black Blood".

Strengths
the main strength of this power is that not only the users would gain a great defence through using Tekkai they would also empower this defence through hardening all of their veins.

Even though it's an exaggeration, it is said that the users of this technique never bleed because of the power of the defence and the hardening of veins.

Weaknesses
The users of this technique can still be hurt through other means such as being burned.

Also this ability relies on the user's skill with busoshoku haki and tekkai, and his actual muscle power.