It's about a guy who has this aura that can't be suppressed, and all the demons want to get him. He can't leave the shrine that he has been in because of the aura he emits.
He finds out that he has a small domain and he can control anything in the small domain. When a demon was in his shrine he killed it and that's how he found out that he could expand his domain from a system (I think) by killing things in his small domain.
He also ends up getting a human disciple and 3 demon disciples. The 1st goal is to get his domain as big as the mountain that he lives on with the sect he makes.
I know that's a lot but info but I can't seem to remember the name.