The compression did more than make the energy dense.
The cosmic energy that filled the air of the dormitory was never truly pure. It carried stray elemental residue, the leftover traces of every cultivator who had ever breathed in the building, and the faint chaotic noise of a world drowning in raw power. Ordinary cultivators had to absorb all of that along with the useful portion and then spend years of their lives slowly cleaning the impurities out of their meridians.
The singularities did the cleaning for him.
Anything unstable, mismatched, or impure could not survive the crushing force at the center of each black hole. It was stripped away and swallowed past the event horizon, never to return. Only the purest core of the energy passed through the needle-thin point and came out the other side.
