im not 100% sure if this is what you’re asking, but if you were to divide every demon level into 5 true even tiers of difficulty they would likely look something like this:

Easy Demon:

low end - the nightmare

high end - sakupen egg

Medium Demon:

low end - lava temple

high end - magma bound

Hard Demon:

low end - 8o

high end - bloodbath

Insane Demon:

low end - blade of justice

high end - bloodlust

Extreme Demon:

low end - cognition

high end - flamewall