Now, because he commands the troops, controls the military formation, and kills enemy generals, he has gathered a thick evil aura. Normally, if he didn't actively cultivate this aura, it would dissipate on its own. But this time, he personally charged into the formation and slew generals before tens of thousands of eyes, causing the aura to be heavily concentrated, naturally condensing.
He walks alone on the path of the Military School, just like the sages of old.
No reason other than his battle achievements being too extraordinary.
Back then, the overlord learned to read and practiced the sword, but he only learned to write his own name, and mastering the sword meant being an enemy of one. He wanted to defeat tens of thousands, which delighted his uncle, who taught him military strategy, yet he only sampled it and did not study diligently.
Still, it did not prevent him from becoming the number one in the history of military formations.