Xi Bolai's first impression of Karuman was that he had killed too many people. Although Karuman looked like a kind old man on the outside, Xi Bolai was certain that this servant of the Nicholas family had killed countless people.
After all, something as nebulous as the sin of killing was within the range of Xi Bolai's calculations.
Everyone who was a Mage would kill many people, including Xi Bolai. He had killed so many people that he could no longer remember them clearly.
However, under normal circumstances, killing someone would follow karma. As long as the person killed was someone who deserved to be killed, one would not have too much killing sin stuck to him.
However, Karuman was completely different. Xi Bolai could tell at a glance that he was covered with killing sin. He concluded that he must have killed many people whom he should not have killed.