Luo Feng had captured Morosa alive this time so that other Sector Beasts wouldn't be able to kill him. By doing so, he hoped that the ultimate king of Sector Beasts would never be born. Then they would stand a chance of surviving the catastrophe of Sector Beasts this time. However, according to Morosa, it was not going to work, so Luo Feng thought of a different way. He had decided to enslave Morosa.
As long as Morosa became his soul slave, Morosa would trust Luo Feng completely from the bottom of its soul. It would even be willing to die for Luo Feng, and it would tell Luo Feng everything it knew.