Why did one-armed Yang Guo choose the heaviest darksteel epee among so many swords left by loneliness?

In the sword tomb, there are several swords used in several stages of Dugu's life: Unknown Sword, Wei Zi soft sword, darksteel epee, and wood blade even has no sword.

Dark iron epee is the third kind of sword used in the martial arts career of seeking defeat alone. The black iron epee is made of black iron and weighs 8 1 kg. Made by Demonbane, he was invincible before he was forty.

Yang Guo is not short of cleverness. He is clever enough. He has mastered at least seven or eight foreign languages. What he lacks is massiness and precipitation. Then what is missing and what to practice. Therefore, the god carving recommended him the third sword-the blade-free epee and the dark iron epee.

You should eat your food bit by bit. You should walk step by step. Haste makes waste. Yang Guo entered the sword burial, and only reached the state of soft sword. It took sixteen years to reach the epee realm. It was difficult to get to wood blade, and it took at least ten years. If we want to reach the realm of no sword, it may take twenty years or even longer. There is still a long way to go to become a top swordsman. Yang Guo is a rookie, so it's good to choose epee directly. If you choose wood blade or Wudian directly, Yang Guo's skill is not enough to get it done.

I'm afraid the reason why we chose epee is because it not only exercises internal force, but also contains the philosophy of seeking defeat in isolation and the realm of sword meaning.