Gravis and Mortis looked at the Black Demon as they readied themselves for battle.
"Are you sure you want to do this?" the Black Demon asked coldly. "I've believed that the friend you were going to call would be more powerful than you, but it turns out that he is also just a Late Major Circulation Immortal King. I told you that you should respect your higher-ups so that you don't accidentally get killed by someone that's not as mildly tempered as I am."
Gravis wasn't there when the two of them talked previously, but he could already picture it very well.
The Black Demon probably thought that Mortis was relying on someone else to become powerful. In the Black Demon's perspective, this was akin to throwing away one's future prospects. He probably honestly only wanted to give Mortis some good advice.
Sadly, the Black Demon talked to Mortis like he was better than him, even though he was in a Realm that Mortis could still fight against.