In the realm of flesh and blood, one only needed to have a strong physique.
But above the Barbarian bones, there was a need for something even more abstract.
And that thing was willpower. Only a willpower that was unafraid of hardship and undefeated in a hundred battles could break through to the brutal bones realm.
It was very difficult to temper one's will. Some barbarian Warriors would go through life-and-death situations to temper their will, while others would survive alone in the wilderness.
Only by going through all kinds of dangers and even going through life and death situations could one temper one's will. And in the process of tempering one's will, countless people would die tragically on the way.
It could be said that only one out of 100 Berserker bones could break through. From this, one could see how difficult it was to have a will.
