Douluo Dalu: Martial Soul, Underworld King Sword, Lord of the Underworld

Ming Fei transmigrates to the era of Tang San in Douluo and awakens the Underworld King Sword Martial Soul on his own, with an Innate Soul Power of level twenty and a world of his own, the Underworld. [The Underworld is a powerful existence of a higher order than a domain. It can naturally conceal the secrets of heaven and hide its tracks. It can also grow by killing enemies and drawing the dead into its realm. The larger the Underworld becomes, the more power it grants him, and the faster he cultivates. In the later stages, it can grow into a world more powerful than the God Realm.] What's more, the Underworld King Sword requires no meditation or cultivation. He only needs to keep killing to rapidly raise his Soul Power Level, spiritual power, and physical strength. From then on, Ming Fei embarks on a path of proving his Dao through slaughter, collecting the dead to expand the Underworld. But he kills no innocent people, only the wicked. In the future, he will even take on the God Realm. He also establishes the Underworld Hall, the Underworld's public representative in the outside world. The Underworld and he remain hidden behind the scenes, controlling the whole game.