The talent [Heresy] could only affect small demons below the grandmaster level.
At first glance, the effect seems to be small.
However, other than the pit of the spawn point, there was no major crisis in the early stages of the new dungeon world.
This meant that Su Mu had a very long period of growth.
In this way, he could use [Heresy] to subdue a group of Xiantian and Houtian realm lesser demons. When they grew up, they would be able to control a group of loyal forces.
If used properly, Su Mu could even use this talent to sweep the entire Monster Race world!
As for how far he could go, it would depend on how he operated.
[Heresy] wasn't a brainwashing technique, it required Su Mu's words and actions to be able to inspire people.
..
In short, from the first day he entered the Pantheon of Demons, Su Mu had gained a group of loyal fans.