A group of people entered the spaceship, which was an aircraft made entirely of time crystals.

Everything will decay with the passage of time, but the time crystal is different, it will become more and more precipitated with the passage of time, so it is extremely hard, it can be said to be the hardest substance in the world, the specific hardness changes with time, the longer it exists , the harder it is.

It is also because it is too hard, so it is difficult to use it concretely. Only the four with the ability to decompose and reorganize matter

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