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Blue Star is located in the center of the universe. On the surface it is a planet with technological civilization, but in fact it is a training ground for training immortals. Training the minds of all the second-generation immortals inside can also be said to be the state of mind. Such training grounds are extremely rare in the universe, but most of them are within the observation or knowledge range of the Universe Federation. After countless years of exploration by the Universe Federation, most of the training grounds in the universe have been found. And the training grounds that are often unknown are all top-notch. The training grounds were all created when the universe was formed. Everyone who comes out of the training ground is not simple. To put it simply, Blue Star cannot be called a planet. It can only become a star after it has grown for countless years. To completely turn into a civilized planet, there are various ways to create civilized planets, but rising stars in the training ground is undoubtedly the most difficult and at the same time the strongest.