the language of blood
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If there is someone who knows the sound of blood, it is Ougai Mori. It comes to him easily, something halfway between music and words everyone can hear but very few are able to understand. Like a mother tongue he assimilated as easily as the air he breathes.
He knows where to cut to kill without inflicting pain, he knows the most painful but not lethal points. Not only that– he knows where to push to shed anyone's blood, knows the words he has to pronounce and the tone he has to put in them to dirty other people's hands and benefit from their foolishness.
It's not his ability, but he has a natural talent to speak the language of blood. A gift that, in his hands, has become the subtlest of arts.