First Evolution

Because the edge of the knife was hidden at this time, no one could see it, so the enemy would lose their vigilance.

Not only that, although the edge of the knife is strong, it is typical of hardships. The sharper the edge, the more it needs to be hidden and nurtured!

A person's growth rate between life and death is the most astonishing, not to mention that when he was in a foreign country and the world was full of enemies, he experienced the **** battlefield where millions of people fought together.

so,

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