Soul Lord and Soul General

In the present world, there is a group of special people who, by some chance, will sign a contract with an independent dead soul, thereby becoming extremely powerful. The world calls them soul generals. There is also a kind of person who is born with a dead soul contract, possesses the soul of a certain king, and leads all the soul generals. The world calls this extremely rare person a soul master. Every Soul Lord wants to command all the heroes in the world and become the overlord. Everyone respects the overlord as the Spirit King. The Spirit King settles in the Spirit King Palace and holds the Spirit King Seal. His more important responsibility is to protect the most precious treasure in the spirit world - the Reincarnation Stone.