I am not sure but is the concept of "pales" British in nature? Where as the rings of hell etc. are from Christanity?
pale
Pronunciation: \ˈpÄl\
Function:noun
Etymology:Middle English, from Anglo-French pel, pal stake, from Latin palus ? more at pole
Date:12th century
1 archaic : palisade, paling
2 a: one of the stakes of a palisade b: picket
3 a: a space or field having bounds : enclosure b: a territory or district within certain bounds or under a particular jurisdiction
4: an area or the limits within which one is privileged or protected (as from censure)
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What the good people of ICE thought when they decided that pales were a nice way to classify demons I have no idea of.
The nine circles of hell is if I'm not mistaking an invention of Dante, and does not come from the teachings of the church. But being an illustration of the christian hell it takes into account the seven deadly sins and other christian concepts. This in my mind makes it a bad fit for a fantasy setting unless you also bring christianity into the setting.
For example the first circle, Limbo, is reserved for the ones who did not know Christ. For example newborn babies who died before being baptized.
There is also one circle for the gluttonous, which means that the god or gods must look upon gluttony as a sin. In roman times the same guy who in christianity would go to hell, would probably be invited to a big party at Bacchus' place.
And the circle for the lustful, no use for that in many a fantasy setting where the gods have walked among the mortals and had a good time in the hay.
Off course, depending on the setting, the circles of hell and the demons/devils that comes with it could work like a charm, but in my campaigns the pales fit much better. Then again, it could just be that I just create my settings in such a way that I can use the RM demons with their pales.