A black star rotated at the center of his chest, right under the sternum and between the lungs. Noah's heart had disappeared, replaced by a dense rotating sphere that executed his organ's previous functions and added new ones.
Noah closed his eyes to feel his body in its entirety. The black star had become part of the innate absorption of "Breath" performed by the magical beasts. It gathered energy inside its core before turning it into primary energy that nurtured his tissues.
Yet, that primary energy appeared slightly different from usual. Its structure didn't change, but there seemed to be more power contained in its fabric. It was as if the dark matter had improved its nature, making it become a better nutrient for his body.
The same went for his blood. The black star filtered and improved its structure before sending it back in the blood vessels. Noah felt his body becoming stronger after every full rotation of the sphere, but the cause wasn't a superior amount of energy.