[quote=@Copperpen]
I think it should progress through not the seven circles, but different understandings and severity of Hell- so the top would be standard Christian hell, with flames and such, and would get progressively worse and worse as the characters approached closer to the source of the Devil. 

I also think there should be an element of survival, with some weapons not harming some enemies- such as requiring a boss's item(s) or something to continue (which gives incentive for the characters to do this, it can be shown in some way that they progress in power).
[/quote]

Well, for that first thing, I can play around with that a bit, but the seven or Nine circles of hell would make a bit more sense for anyone new to the topic, however, I will take this into consideration, and will provide you a personal update on what I have via PM. Once a version is picked, I'll post an edited Update, here. 

For that second thing, there will be quite an element of survival. Certain enemies will be more prone to certain weapon types versus others. Certain equipment will also hold elemental-esque qualities, such as slowing, fire, ice, strength boost, and more. For example: say you face a demon with a rocky like skin. Blades wouldnt work as well with it, but perhaps spells or even blunt weapons like Hammers would work better against it.