Black Gas Invading the Dantian

In the starry sky, a ball of black gas that was even darker than the starry sky and seemed to have swallowed even light appeared out of thin air and continuously circled in Chu Nan's palm.

Looking down at the black gas, Chu Nan frowned and fell into deep thought.

After the battle with Princess Romanti, he did not return to the surface. Instead, he stayed in the starry sky for three Earth days and had been focused on studying the various details of the battle with her.

The most important thing was to study the Exterminating Heart Technique used by Princess Romanti.

Through these three days of research, he further confirmed that the Exterminating Heart Technique used by Princess Romanti was indeed of the same origin as the cultivation method used by that mysterious girl.