Li Shenron
Legend
Just checked the NPC gallery at the end of the MM for examples, and tried to notice any possible trend. It's hard to tell because there are not many spellcasters there:
Druid: CR 2, HD 5, level 4
Cult fanatic: CR 2, HD 6, level 4
Priest: CR 2, HD 5, level 5
Mage: CR 6, HD 9, level 9
Archmage: CR 12, HD 18, level 18
Very hard to tell with only 5 specimen... notice that all these actually say what is their spellcaster's level. This could be used as a reference. But then the similarities with PC classes end because:
- none of these have other class abilities (e.g. wildshape, channel divinity etc.), just spells and weapons
- they all have somewhat inferior ability scores compared to PCs
- they generally seem to have buffed hit points
Notice how the two pseudo-Wizards (Mage and Archmage) have HD = level. However their HD is not d6 but d8. But then, considering that the PC generally have higher Constitution score, I don't think there is a significant difference. Overall it seems CR = 2/3 of level = HD.
The other three caster NPCs don't all have same HD as their spellcasting level, their HP slightly buffed. They all have CR 2. The ratio there looks more like CR = 1/2 of level, and CR = 1/2.5 or 1/3 HD.
All the other NPCs don't cast spells, but some trends can be noticed there too. Those who have interesting CRs (let's say higher than 2) seem to have a ratio around CR = 1/3 HD --> notice that here I am comparing it with the HD. All of them actually have d8 hit dice, and since they are more similar to Fighter-types, this actually means that they definitely have less hit points than a PC of a level equal to their HD.
A notable exception is the Assassin which has sneak attack as an 8th level Rogue, CR 8 and 12 HD. So definitely more hit points than an 8th level Rogue, but otherwise here CR = level = 2/3 HD.
Given the previous considerations on all the extras that the PC classes get (including higher ability scores), if we re-designed these 5 NPCs using PC classes (of the same spellcasting level when applicable, or of the same HD otherwise), the CRs would obviously increase... and it would increase most for non-casters (because they have more class features that these NPCs do not have), something less for 'divine' casters (who have some class features in addition to spells) and least for mages (who have very few class features beside spells).
At this point I wouldn't be surprised if it turned out that the most simple possible formula i.e. CR = class level is actually fairly close to reality
Druid: CR 2, HD 5, level 4
Cult fanatic: CR 2, HD 6, level 4
Priest: CR 2, HD 5, level 5
Mage: CR 6, HD 9, level 9
Archmage: CR 12, HD 18, level 18
Very hard to tell with only 5 specimen... notice that all these actually say what is their spellcaster's level. This could be used as a reference. But then the similarities with PC classes end because:
- none of these have other class abilities (e.g. wildshape, channel divinity etc.), just spells and weapons
- they all have somewhat inferior ability scores compared to PCs
- they generally seem to have buffed hit points
Notice how the two pseudo-Wizards (Mage and Archmage) have HD = level. However their HD is not d6 but d8. But then, considering that the PC generally have higher Constitution score, I don't think there is a significant difference. Overall it seems CR = 2/3 of level = HD.
The other three caster NPCs don't all have same HD as their spellcasting level, their HP slightly buffed. They all have CR 2. The ratio there looks more like CR = 1/2 of level, and CR = 1/2.5 or 1/3 HD.
All the other NPCs don't cast spells, but some trends can be noticed there too. Those who have interesting CRs (let's say higher than 2) seem to have a ratio around CR = 1/3 HD --> notice that here I am comparing it with the HD. All of them actually have d8 hit dice, and since they are more similar to Fighter-types, this actually means that they definitely have less hit points than a PC of a level equal to their HD.
A notable exception is the Assassin which has sneak attack as an 8th level Rogue, CR 8 and 12 HD. So definitely more hit points than an 8th level Rogue, but otherwise here CR = level = 2/3 HD.
Given the previous considerations on all the extras that the PC classes get (including higher ability scores), if we re-designed these 5 NPCs using PC classes (of the same spellcasting level when applicable, or of the same HD otherwise), the CRs would obviously increase... and it would increase most for non-casters (because they have more class features that these NPCs do not have), something less for 'divine' casters (who have some class features in addition to spells) and least for mages (who have very few class features beside spells).
At this point I wouldn't be surprised if it turned out that the most simple possible formula i.e. CR = class level is actually fairly close to reality

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