The Wind Pillar's Advancement

However, Su Chen had never expected the Wind Pillar to reach his level. It would be enough if the Wind Pillar's killing intent could briefly leave his enemies unable to resist.

It was an instinct. When faced with a threat to life and death, especially one great enough, a person would be left with nothing but fear and despair. They might not even be able to muster the thought of fleeing.

After Su Chen told the Wind Pillar about the three breathing techniques, the Wind Pillar immediately began trying them. However, he soon felt uncomfortable, and his breathing became extremely labored.

It felt as if his insides were severely congested. When using Shadow Breathing, it was like having most of his nose blocked, leaving only a tiny slit through which to breathe. It was terribly uncomfortable, as if he might suffocate to death at any moment.

After lasting for roughly thirty breaths, the Wind Pillar began gasping heavily, his face flushed crimson.

"Thirty breaths. Not bad."

"Breathing techniques need to be combined with training to greatly increase your strength. So today, your task is very simple: weighted running."

Weighted running?

The Wind Pillar raised his eyebrows slightly. This seemed to pose no difficulty for him.

Su Chen took more than a dozen small pieces of iron from inside the house and tied them to the Wind Pillar's limbs. Then he said calmly, "Your task is simple. Run one hundred and fifty kilometers today."

"I calculated it. The Demon Slayer Corps headquarters here has a perimeter of roughly two kilometers. You only need to run around it seventy-five times. During that time... you cannot stop."

A rare seriousness appeared on Su Chen's face.

The Wind Pillar's expression changed slightly. One hundred and fifty kilometers, while carrying weights—even though the iron blocks