Low-level evil is the ordinary, everyday, evil exemplified by politicians, managers, journalists, doctors, professors, lawyers etc in the modern West - and by most of the passive, irresponsible, non-thinking and manipulated masses.
Low-level evil is atheist, materialistic (disbelieving in the realms of soul and spirit), this-worldly exclusively; and devolves towards hedonistic selfishness.
This means that the bottom-line "morality" for Low-level evil is how "I" (currently) feel about things; and how I can feel good about myself/ people/ things, and avoid suffering - whether physical, social or psychological.
In this sense; for Low-level evil "myself" is God - or takes the place of God as the bottom-line reality, because there is nothing higher or other than how I currently perceive the situation from "my" perspective.
As I implied: this morality of self-gratification is currently the normal state of values for most people in The West; and characterizes almost-all people who have some kind of leadership role, wealth, power, and high status .
The Intermediate level are the Satan-worshippers, the demonic practitioners.
Satan is their god - or, at least, the patron to whom they look for protection and favours.
Intermediate-level evil beings may or may not believe in God as the Creator - but they do believe in the spirit realm; and they believe that this world is ruled and controlled by the devil and the demons - the powers of purposive evil.
Consequently they are focused on appeasing and pleasing Satan* - by whatever means they regard as effective.
High-level evil is the evil of Satan and "senior" demons.
These at the High-level know that God is real, and they know God created this reality. They are therefore theists.
Approaching the Highest-level of evil, therefore, the goal is partly positive: to retain creation but to take-over creation and remake it in accordance with Satan's wishes: to make Satan explicitly the sole god of this-world.
At the very Highest-level, however; the goal is to subvert, corrupt, and eventually destroy all of creation - because God is hated, and all God's work is hated.
So; at the Low-, Medium- and High-levels of evil; we have
1. Self-worshippers
2. Satan-worshippers
3. God-haters
*My best guess is that there is only one Satan at a time, at the top-of the hierarchy of evil and providing its cohesion and direction. But that there may have been more-than-one Satan through history. Indeed, I think this is likely, and that the role of Satan has probably more than once been usurped (and the first and perhaps other Satan's deposed) - given the nature of demons.
