Hell magic 'Corruption'.
As with all magic.
The more unfamiliar the concept, the more likely it is to be high-level magic.
However, 'Hell Magic' is quite distant from ordinary magic systems.
When you spread out all the magic in the world, it draws a picture like a spider's web.
If there is a tree called elemental magic, branches like fire, water, earth, and wind split from it.
But hell magic is different.
This is because it exists separately from the great trees that spread out centered on magicians.
Take hellfire, for example.
It's magic that spews terrible flames that burn everything.
It sounds like it would be in the same system as 'Elemental Magic: Fire'.
But in reality, it's completely different.
Even a magic layman would know.
That terrible conflagration.
The earth splits and hell appears.
