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Spiritual tools are ultra-ancient weapons made by the legendary killer to fight against the world government. There are 100 pieces in total. Among them, there is one of the strongest unknown spiritual tools, which is called the King of Spiritual Tools. After his death, his treasures were shipped around the world by the government. In order to obtain this powerful equipment, people became killers and established trade unions, with the purpose of obtaining spiritual tools or accepting tasks in the trade union to make a living. Some killers even dreamed of obtaining the king of spiritual tools! As for killers, they are a profession that kills other killers in order to steal their spiritual tools. It is difficult for killers to survive in this world without possessing spiritual tools. In this era known as the Age of Spiritual Tools, there is a well-known union that gathers all kinds of powerful killers. The name of this union is-ORAS!