The saying, 'The fame of a general is built on 10,000 lives', only refers to the commander leading his troops in battle. While it wasn't anything extraordinary for 10,000 men to die in battle, it was impossible for all 10,000 of them to be killed by the general alone! That was the combined efforts of the whole army! It didn't refer to a single person killing 10,000 people!
However, Ling Tian was already on a completely different level! He had gone against everything they knew! After charging in and out of the 400,000 man army, thousands of people had already perished under his guandao! But from his calm and chilly gaze, he didn't seem the least bit affected by the result in front of his eyes. Every step he took was still steady and without hesitation. Every time he brandished his weapon, he did it heartlessly without any mercy!